







Opérations de base 
20030705 

AnneMarie pose la question : Je m'appelle AnneMarie et je suis enseignante de 5e année à l'école Domaine des copains de Balmoral au NouveauBrunswick. Récemment, j'ai participé à un concours intitulé: Budweiser King Pack Nascar Hat Promo. Afin de réclamer le prix, qui est une casquette, je devais répondre à une question réglementaire. Il s'agissait d'une phrase mathématique qui se présentait comme suit: 4 x 26  24 / 8 = qui se lit: 4 fois 26 moins 24 divisé par 8 Claude Tardif lui répond. 





des conversions de bases différentes 
20030104 

Christian pose la question : Je cherche désespérément la (les) règle(s) pour réussir des conversions de bases différentes : de base x vers base y. Claude Tardif lui répond. 





Base 6 to base 4 
20180325 

Malik pose la question : Hi Sir..!
I just want to know the proper example with a brief explanation of conversion of base 6 into base 4.
kindly reply me as soon as possible..
Thank you Penny Nom lui répond. 





Baseball Cards 
20170420 

Raquel pose la question : A minor league baseball team gave away baseball cards to each person entering the stadium. One group receives 28 baseball cards. A second group received 68 baseball card. If each person entering the stadium receive the same number of cards, what was the greatest possible number of baseball cards that each person could have received? Penny Nom lui répond. 





Forming a cone from a circle 
20170415 

Tasha pose la question : A sector of a circle subtends an angle of 216 degrees at the centre, If this sector is used to form a cone of vertical height ,8cm, calculate the base radius of the cone Penny Nom lui répond. 





A block base for a plywood rectangle 
20170218 

Joe pose la question : How many cinder blocks 16x8 would i need to build a solid base for a plywood base 54inches wide and 30 inches deep Thank you Penny Nom lui répond. 





Addition and subtraction base 5 
20170129 

BABAWALE pose la question : Simplify 342five +132five223five Penny Nom lui répond. 





4444 base five 
20161111 

John pose la question : If 4444 is a number in Base5, is 624 its value? Penny Nom lui répond. 





Subtraction of two numbers in different bases 
20161007 

Wica pose la question : Hello,
So happy I found this site. I am having problems with bases. My question is :
Please perform the subtraction between two number over different bases :
A. (5874)base 12  (216)base 9
B. (216)base 9  (5874)base 12 Penny Nom lui répond. 





A square based box and a cylinder 
20160326 

rajpal pose la question : i m trying to calculate an area required to hold 4.4 mln cubic metres of volume.
I used square and I get below result
A box shape that has dimensions 1500 meters (1.5km) by 1500 meters (1.5km) by 2 meters depth has a volume of:
= 4,500,000 cubic meters (4.5 mln cubic meters)
but when I use a cylinder shape, i get below result
A cylindrical shape that has a radius of 850 meters and a depth of 2 meters has a volume of:
= 4,539,600 cubic meters (4.54 mln cubic meters approx)
why is it that the cylinder, though of same depth holds more volume than a square?
kindly clarify. Penny Nom lui répond. 





A problem in base x 
20160325 

Malith pose la question : determine the value of base x of (211)x = (152)8
please mentioned the steps
Thank you Penny Nom lui répond. 





Division base 5 
20160201 

Jenalee pose la question : I am having problems with a dividing bases question. I reviewed two that I could find in the database and tried the question as shown but I am still getting the wrong answer.
My question is 32\24043 to the base of 5 for both. Penny Nom lui répond. 





Subtraction in a base larger than ten 
20160131 

Jenalee pose la question : Hello,
So happy I found this site. I am having problems with bases. My question is 97B9  6A3A base 16 for both.
Please help. Penny Nom lui répond. 





Subtraction in base 8 
20151021 

Adi pose la question : Hi!
Can you help me with a nagging problem, I searched a lot over the web and couldn't find it.
I saw this site I gave it a try and I found it to my liking.
I am confused how to subtract bases from other bases:
567 (in base 8)
 456 (in base 8)
______________
?????????
How do you do this? I do know how to carry and subtract with different bases. Can
you please help me?
Thanks,
Adi Penny Nom lui répond. 





Subtraction base 5 
20150829 

nakita pose la question : can u explain the quinary subtraction ...
(3000) (2342) all the numbers are in quinary number system Penny Nom lui répond. 





Excavating a basement 
20150412 

Randy pose la question : The cost of excavation is $4.50/ cu yd. Find the cost of excavating a basement 87 ft long, 42 ft wide, and 8 ft deep. Penny Nom lui répond. 





Integers in different bases 
20150305 

Michael pose la question : Let k be a positive integer so that 28 (subscript)k = 132 (subscript)5 Penny Nom lui répond. 





211basex=152base8 
20141215 

Humaira pose la question : 211basex=152base8 Penny Nom lui répond. 





A truncated, squarebased pyramid 
20141123 

Hannah pose la question : A designer vase has the shape of a truncated, squarebased pyramid. The base of the vase is a square with a side length of 15 cm. The area of the square opening is 70.56 cm2. Each of the four sides is a trapezium with slant sides 9 cm long. Find (to the nearest square centimetre) the total surface
area of the vase. Penny Nom lui répond. 





logbase4 (sin x) = 0.5 
20141026 

Susan pose la question : Solve for x: logbase4 (sin x) = 0.5 Penny Nom lui répond. 





A truncated squarebased pyramid 
20141022 

Beth pose la question : How do you find the height of the original squarebased pyramid when given the sides (12cm) of the base and height (6cm) of the truncated pyramid, as well as the sides (3cm) of the base of the chopped off top (chopped off parallel to the base)? Penny Nom lui répond. 





Division in base 3 
20140930 

Nnubia pose la question : 1021 in base 3 divided by 2 in base 3 Penny Nom lui répond. 





Base 6 
20140910 

Amanda pose la question : using base 6, what is the next number after 25? 35? 55? and 455?
I need to be able to show the base 6 material. Penny Nom lui répond. 





35 base 6 
20140910 

Amanda pose la question : Sorry I am having trouble understanding base,
35 in base 6 means 3 10's and 5 ones, which is the same ____ in base 10? Penny Nom lui répond. 





211(base x)=152(base 8) 
20140909 

Vaidehi pose la question : Find the base value (i.e. x):
211(base x)=152(base 8) Penny Nom lui répond. 





Multiplication in base five 
20140807 

Alise pose la question : Hi Maths Central!
I was wondering if you could help me with multiplying in base 5. I have read a question previously answered by you in regards to this but got fairly confused by it and was hoping you could help me with my question.
My question is: Multiply 1422 base 5 by 21 base 5 keeping these numbers and answer in base 5.
Would you also be able to explain how to get to the answer?
Thanks! Penny Nom lui répond. 





How can eight eights be 1000? 
20140620 

Aamir pose la question : The digit 8 if we add it 8 time in it the answer should be equal to 1000.it may possible.i.e.,
8+8+8+8+8+8+8+8=1000 Penny Nom lui répond. 





Forming a cylinder from a square 
20140608 

kalyani pose la question : the curved surface of a cylinder is a square of diagonal 2*square root of 2. What is the area of the base of the cylinder? Penny Nom lui répond. 





6 inches of dirt in a baseball field 
20140601 

Mary pose la question : The baseball field is 20,000 Square feet, 6 inched deep
I need to know how many cubic yards of dirt this will generate. Penny Nom lui répond. 





Converting to base 5 
20140410 

Usama pose la question : Convert the numbers used in the following expressions into those of basefive and solve :
21+34108+62
Convert the result so obtained into decimal system and thus check your answer? Penny Nom lui répond. 





The diameter of the base of a cone 
20140223 

elwin pose la question : i have a sector of a circle that has 120 degree and 6 cm length. What will be the diameter of the base of the cone.
and what is the diameter of the angle is changed to 180. Harley Weston lui répond. 





Counting in base five using words not digits 
20140125 

Randy pose la question : We all know how to count (in the base 10/decimal system) using words not numbers. For example: one, two, three, four, five, six, seven, eight, etc. However, in base 5 (for example) how would you count (in words). For sure  in base 5 the number 1 could be "one", the number 2 could be "two". However there seems to be no words to describe base 5 numbers beyond 0,1,2,3 and 4 (and perhaps 10). In base 5 the number 10 is not ten. Rather it is "five". In base 5 what word(s) describe numbers larger than 10? What words are used for 11, 12, 13, 14, 20, 21, 22, 23, 24, 30, 44,...etc. Also, consider a man and woman were married in the Gregorian year 1964. If they had an anniversary tomorrow  how long would you say they've been married in base 5 speak? In numbers their Golden Anniversary would note 200 years of marriage in base 5. How would you articulate their years together in base 5? I don't recall seeing verbiage to represent numbers in any system other than the decimal/base 10 system. Do such things exist for other systems? Harley Weston lui répond. 





Base 5 arithmetic 
20131127 

samuel pose la question : Good day sir, please i don't understand when you say 4x4=13 in base five? In fact, am always having difficulties in addition, subtraction, division and multiplication of number in the same base other than base ten. Please can you give me one example each with details explainations? Penny Nom lui répond. 





Base 5 arithmetic 
20131012 

Obassy pose la question : (4 2 4 3)(1 3 x 4)=( Y 3 4 4),find the value of x and y in the subtraction above carried in base five? Penny Nom lui répond. 





Base 5 
20130930 

Zakir pose la question : Sir I wanna know something about base 5 number system
Why we use it and who use this ? and what is the purpose of it Robert Dawson lui répond. 





How can I teach how to change bases? 
20130220 

Tammy pose la question : How can I teach how to change bases? For example 80 base 10 changed to base 3.
Thank you! Harley Weston lui répond. 





Multiplication in base two 
20130201 

Michael pose la question : multiply in the indicated base
110two*11two Penny Nom lui répond. 





The multiplication table for the different bases 
20130201 

sylvia pose la question : I am having a difficult time trying to figure out how to fill in the multiplication table for the different bases. i don't know how to get the numbers. Penny Nom lui répond. 





The hypotenuse 
20120906 

Jeevan pose la question : how can i find the height and base of a right angle triangle if i have the hypotenuse only ? Penny Nom lui répond. 





Expanded exponential form? 
20120612 

Ramon pose la question : express the numbers 990 614 000 005 in expanded exponential form. Harley Weston lui répond. 





Division in base eleven 
20120527 

Zoe pose la question : How do you divide numbers that are in base 11?
For example;
9A7A6A divided by A Penny Nom lui répond. 





How to find the base length of a isosceles triangle if only the sides are given? 
20120425 

aqilah pose la question : how to find the base length of a isosceles triangle if only the sides are given? Chris Fisher lui répond. 





The number of digits in a number base m 
20111222 

Jash pose la question : Assume there is a number system of base m.
The one property of this system is: If 2 numbers written in this system, which have 'a' and 'b' as the number of digits are multiplied, then the product of the 2 numbers will have a number of digits which is a function f(a,b).
In other words, as long as the number of digits of the 2 numbers are constant, the number of digits of their product is a constant.
Find m. Robert Dawson lui répond. 





Converting from base 4 to base 10 
20111129 

anjg pose la question : How to convert base 4 number 2^11 to base 10 number? Penny Nom lui répond. 





Expanded form 
20111012 

Chris pose la question : Write this number in expanded form
4 326 180 501
Thanks!!! Penny Nom lui répond. 





Converting base 3 to 5 
20110228 

Harry pose la question : Hey Math Central, I came across your website and im in need of help on my maths c assignment. I have to convert base 3 to 5 without converting back to ten. I heard that you can use patterns in 3 and 5 to make an equation but im not sure how to and i also heard you can use logarithms but i dont know how to use those so im kinda stumped. Robert Dawson lui répond. 





A player runs from second base to third base 
20110130 

Marie pose la question : A baseball diamond is a square with side 90 feet in length. A player runs from second base to third base at a rate of 18 ft/sec. At what rate is the area of the trapezoidal region, formed by line segments A, B, C, and D changing when D is 22.5
Distance A is the players distance from first base when running from 2nd to third. Distance D is his distance from 3rd base. Distance C is the distance from 3rd to 3rd to Home. Distance B is the distance from Home to First.
I have found dA/dt in a previous problem. Penny Nom lui répond. 





How far must the pitcher travel to get to the ball? 
20101104 

ken pose la question : A baseball player bunts a ball down the first base line. It rolls 35ft at an angle of 26 degrees with the first base path. The pitchers mound is 60.5 ft from the plate. How far must he travel to get to the ball. Penny Nom lui répond. 





The base of an isosceles triangle 
20101024 

Brian pose la question : how can I find the base of an isosceles triangle from the height and the perimeter? Penny Nom lui répond. 





An 18ft round pool 
20100719 

christine pose la question : will an 18ft round pool fit on a 12x16 ft rectangular cement slab? Tyler Wood lui répond. 





The number of gallons of water in a basement 
20100523 

George pose la question : A basement with dimensions 68 ft long by 42 ft wide by 10 ft deep is flooded to the ceiling calculate the number of gallons of water in the basement. 70 Penny Nom lui répond. 





Divisibility by 3 
20100523 

Cathleen pose la question : To math central. I have to do a maths extension question that I don't understand. At first I thought I did.
It is about the dividing by three. In one part of the question, it asks me to show that the rule of division by three does not work for 23142 with a little 5 down the bottom.
What doe base 5 mean? We first thought that the little 5 down the bottom meant multiplying y the power of five.
Can you please tell me what it means so I can finish this question? Penny Nom lui répond. 





The base area of rectangular prism 
20100305 

Desiree pose la question : How do you find the base area of rectangular prism that has 4 cm by 4cm by 6cm ? Penny Nom lui répond. 





Triangles on a base of 2.4 meters 
20091226 

Allan pose la question : Please,How do I calculate the height of a triangle when I only know the width of the base line,It is 2.4 mtrs. Thankyou very much. Penny Nom lui répond. 





Bases larger than ten 
20091214 

Nick pose la question : For numbers in bases larger than ten, what are the digits by mathematicians' conventions?
I assume the first 10 are always 09. I know two computer science conventions (for hexadecimal (AF caseinsensitively) and for base 85 (casesensitivity plus 23 other characters)) and as a school student I learned that base 12 uses either T and E (which confused me when I thought they stood for Eleven and Twelve) or A and B, the latter as capitals only. Clearly, these conventions are in conflict.
I saw your reply in http://mathcentral.uregina.ca/QQ/database/QQ.09.99/magin1.html as accessed a few minutes ago but hope that in the 10 years since then mathematicians have arrived at a convention. Have they?
Thank you.

Nick Claude Tardif lui répond. 





A number base that's not a positive integer 
20091211 

Nick pose la question : Is it possible for a number to have a base that's not a positive integer?
Base 1 gives a result that's meaningless but possible. I have no concept of a base 0, a negative base, or a fractional base, never mind any other base. I think there isn't any base that's not a positive integer, but, knowing that math keeps jumping ahead and sometimes has inventions before anyone knows how to exploit them, I think I'd better ask.
Thank you.
Nick Robert Dawson and Claude Tardif lui répond. 





A baseball diamond 
20091118 

maelee pose la question : the official distance between home plate and second base in baseball diamond is 120ft. Find the area of the official ball diamond & the distance between the bases. Robert Dawson, Chris Fisher and Penny Nom lui répond. 





A drawing of a baseball diamond 
20091109 

Beth pose la question : My husband has a drawn diagram on a piece of paper of a baseball diamond. He knows that on the paper 1 1/16" (1.6875") = 90 actual feet. How do we calculate how many feet 5 7/8" on the paper would be? Penny Nom lui répond. 





Subtraction base 5 
20090809 

Nikki pose la question : can you help me how to do subtraction in base 5 notation. example is 3434  51?
how do you do this in base 5?
can you please explain how you do this & the answer as i have no idea.
Thank you kindly
Nikki Harley Weston lui répond. 





A base 7 number and a base 9 number 
20090709 

koteawarao pose la question : Find a base 7 threedigit number which has its digits reversed when expressed in
base 9.
ans: (281) base 7 and (182) base 9 Harley Weston lui répond. 





How do you convert 1248 to base 6? 
20090502 

Tamara pose la question : How do you convert 1248 to base 6? Penny Nom lui répond. 





Adding in base six 
20090329 

Lucy pose la question : If you are working in base 6,
what do you have to add to 4(base 6) to get 10(base 6)???? Penny Nom lui répond. 





The base of a triangle 
20090325 

yinna pose la question : how do I find the base of a triangle who's height is 2 times the base and the area is 9? Penny Nom lui répond. 





The base and height of an isosceles triangle 
20090323 

Chris pose la question : How do you find the base and height of an isosceles triangle that has 2cm legs? Harley Weston lui répond. 





Multiplying in different bases 
20090225 

Susan pose la question : 11 base 2 X 22 base 3 + 33 base 4 = _________ base 5 Robert Dawson lui répond. 





In what base is 3x3= 10? 
20090214 

David pose la question : In what base is 3x3= 10, 3x3=11, 3x3 = 12? is there a fast way to see this or do I have to create multiplication tables until I find the right one? Penny Nom lui répond. 





Division in different bases 
20081202 

MICHELLE pose la question : DIVIDE 538 BY 14 IN BASE 2, 3, 4 & 5 Penny lui répond. 





A log base 2 problem 
20081126 

dave pose la question : solve for x
(log base 2 of x)  (log base 2 of (x2)) = 3 Penny Nom lui répond. 





The height, base and perimeter of a triangle 
20081117 

Zack pose la question : How would i calculate the height of a triangle if the base is 10cm and the area is 50cm²?
If possible how would i calculate the length around the the triangle. Penny Nom lui répond. 





Bags of pennies 
20081011 

paul pose la question : jenny divided 15 pennies among 4 money bags.she could then pay any amount from 1p to 15p just by giving bags.how many pennies did jenny put in each bag? Penny Nom and Victoria West lui répond. 





The height and base of a triangle 
20080912 

Bailey pose la question : The length of the base of a triangle is 1cm less than 5 times the height of the triangle. The area of the triangle is 21 square cm. What is the the height of the triangle and the length of the base of the triangle? Stephen La Rocque lui répond. 





Aboriginal number groupings 
20080904 

Barbara pose la question : Our current place value system is based on the notion of 10s. Did Aborginal people use a similar system or did they group numbers differently? Harley Weston lui répond. 





Four weights 
20080825 

Darla pose la question : A balance had known weights of 1/2 lb, 1/4 lb, 1/8 lb, and 1 oz. Edna's object weighted 2 oz. more than Paul's. Each used 3 known weights to weight his or her object. which know weights did each use? Penny Nom lui répond. 





The base of a triangle 
20080810 

Mark pose la question : What is the formula I need to use to find the base of a triangle sail that is 16 feet high and has an area of 64 square feet. Stephen La Rocque and Penny Nom lui répond. 





Angles in a regular tetrahedron 
20080807 

Carla pose la question : Hi guys,
A regular tetrahedron has all its edges 8cm in length.
Find the angles which an edge makes with the base.
Thanks.
Carla Penny Nom lui répond. 





How do you change bases? 
20080617 

Peter pose la question : How do you change bases eg. 121 from base 3 to base 5? Penny Nom lui répond. 





The path of a baseball 
20080604 

Tom pose la question : How high would a batter have to hit a ball to clear the stadium roof in right field
if the distance to the right field fence is 320 feet from home plate? Is this solvable? Janice Cotcher lui répond. 





Base 5 arithmetic 
20080306 

Jana pose la question : Hello, my name is Jana, i have asked a question here previously about how to count in base5. I am happy now because i can convert any number now and it is very easy for me. The only thing i am having trouble with is understanding how to do a maths sum or times base5 numbers. it is just a bit hard for me. So do you think you could explain how to do a sum in base5 and how to do a multiplication sum. Please help...Thankyou Jana!! Harley Weston lui répond. 





Convert from base 6 to base 12 
20080302 

Jade pose la question : I am trying to convert 13405 base 6 to a base 12 number. I am not allowed to go into a base 10 number. How will can I base 12 without doing anything with base 10? Thank you kindly. Stephen La Rocque and Penny Nom lui répond. 





Counting in base 5 
20080224 

Jana pose la question : my name is Jana, i really need help with a maths question at school. Im confused about how to count up from120 in a base5 format! I'm in year 5 and i really don't get all the complicated stuff. Stephen La Rocque lui répond. 





Multiplying numbers in bases other than 10 
20080108 

Imaiya pose la question : In class we've been learning about numbers with a base other than ten. For example, base 7, base 5,
and base 6. What's really stumping me is how to multiply these numbers, when they aren't a base of 10.
I've had it explained to me once, but don't seem to understand it. Here are the equations, and I've listed the first few numbers for that particular base.
Base 5: 0,1,2,3,4,10,11,12,13,14,20 etc... The Equation: 34 x 42
Base 9: 1,2,3,4,5,6,7,8,10,11,12,13,14, etc... The Equation: 56 x 78
If you could explain to me how to multiply numbers with any type of base, I'd really appreaciate it. Also
if you could show me how to do one of the questions that I listed, that would really help me =) Thanks so much,
and once again, thank you for your great site! Stephen La Rocque lui répond. 





Representing different bases 
20071205 

Sudhir pose la question : What does a number subscripted to another one denote? (I know that a number superscripted to another denotes the power, but the subscript number is something I have never seen before.) Stephen La Rocque lui répond. 





The base and height of a triangle triangle 
20071031 

mike pose la question : How do you find the length of the base or the height of a triangle if the area is 30 square feet? Penny Nom lui répond. 





Converting bases 
20071024 

Johanna pose la question : Is there an easy way to convert from base to base. For example, base 5 to base 9 or base 2 to base 4 etc Stephen La Rocque and Penny Nom lui répond. 





Paying with silver  Part 2 
20071017 

Shanna pose la question : The paying with silver problem. I understand how to do the problem, but could you please explain how you would use base 2 arithmetic to solve it. Penny Nom lui répond. 





Base 10 to base 5 
20071009 

Angela pose la question : I've been searching online for the past week and I cannot find an Algorithm to convert from base 10 to base 5. Can anyone give me a stepbystep instruction on how to do this? Stephen La Rocque lui répond. 





Log base 2 of log base 2 of x 
20070627 

alex pose la question : y = log base 2 of lag base 2 of x
The slope of the tangent to the given curve at its xintercept is..? Harley Weston lui répond. 





Base seven 
20070519 

Dan pose la question : A number X is converted to base 7 and becomes a four digit number. Its leftmost digit is removed and written again as the rightmost digit. The number thus obtained is twice X. Find the decimal representations of all such numbers X. Penny Nom lui répond. 





In what base does 25+25=51? 
20070403 

Jenna pose la question : In what base does 25+25=51? Stephen La Rocque and Penny Nom lui répond. 





Finding the vertical height of a roof 
20070305 

Zainab pose la question : The question is: If the vertical height if a triangle is half the width of the base and the slant length is 6 metres, find the exact vertical height of this part of the roof. I'm actually confused about finding out the height of an equilateral triangle if you're only given the length or slant height. Please help! O.o Stephen La Rocque lui répond. 





A 3digit number in base 7 has its digits reversed when expressed in base 9. 
20070128 

Ashley pose la question : A 3digit number in base 7 has its digits reversed when expressed in base 9. Find this number. Penny Nom lui répond. 





Base 5 
20061211 

Shelley pose la question : how do you convert decimal numbers to a given base for example 2,875 to base five? Stephen La Rocque lui répond. 





A problem involving logs 
20061126 

Beth pose la question : any help would be appreciated on how to solve without using the change of base formula for logarithms in the solution and check of the solution!!!
log256 (x) + log16 (x) + log4 (x) + log 2 (x) = 7/4 Stephen La Rocque and Penny Nom lui répond. 





Arithmetic with base 2 
20061126 

Yuva pose la question : can we do arithmetic ,base 2. If yes, how and if not, why. Stephen La Rocque lui répond. 





A cone with an oval as base 
20060301 

Richard pose la question : I am trying to find the volume of a cone that is not round but oval. Penn Nom lui répond. 





how can i find the height of a triangle if i have the base and the hypotenuse 
20060127 

Kelsey pose la question : how can i find the height of a triangle if i have the base and the hypotenuse Penny Nom lui répond. 





Converting from base ten to base five 
20050921 

Julie pose la question : My sister is home schooled and we are trying to convert from base 10 to base 5. We are trying to teach and we have never had this in school. If we could have some examples of some problems and how to do them we would appreciate this. Penny Nom lui répond. 





cos x * cos 2x * cos 4x * cos 8x 
20050829 

Leandro pose la question :
A = cos x * cos 2x * cos 4x * cos 8x
What's the value of log A at base 2?
Chris Fisher and Penny Nom lui répond. 





The base of a triangle 
20040525 

Ralph pose la question : With a 30 degree angle at the top of a triangle and a height of 15 what is the base? Penny Nom lui répond. 





Related rates and baseball 
20040426 

Bethany pose la question : A baseball diamond is the shape of a square with sides 90 feet long. A player running from second to third base at a speed of 28 feet/ second is 30 feet from second base. At what rate is the player's distance from home plate changing? Penny Nom lui répond. 





Baseball games 
20040314 

Fabian pose la question : Let's say I have 12 different Baseball games. There is one of only 2 possible outcomes for each of the 12 games. How would I fugure out how many combinations there are for the 12 games and for 11,10, and so fourth.
Penny Nom lui répond. 





Arithmetic in bases other than 10 
20031022 

Kim pose la question : how do you add, subtract, multiply and devide in base 3, base 5, etc? Penny Nom lui répond. 





1 + 1 = 10 
20030917 

David pose la question : could you please explain to me how 1+1=10 thanks Penny Nom lui répond. 





Converting from base 10 to base 5 
20030910 

Susy pose la question :
My son, who is 9 in grade 5 has been asked to convert base 10 numerals into base 5. His first question of: 24(10) he has calculated to be 4x5 + 4x1 = 44 (5) The next question however is the tricky one.Ý We know the answer is supposed to be 100 but we find it difficult to get this in the way he understands it. 25 (10) = _________________ 100 (5) Can you help us figure out how we reach the answer. Claude Tardif and Penny Nom lui répond. 





Converting to base 10 
20030828 

Karen pose la question : My son is in 5th grade.Ý He is learning how to convert numbers from base 2 to base 10, and base 5 to base 10.Ý Can you explain it to me in the simplest terms? Penny Nom lui répond. 





How many hits? 
20030406 

Jack pose la question :
My name is Jack. I'm a uncle. Student is in the 5th grade email is above. If a baseball player at sping training had a good season with the following: one seventh of his hits were doubles. 12.5% of his hits were home runs. But didn't have any triples. How many hits did he have? Can you give me an explanation of you solved the problem. Penny Nom lui répond. 





Numbers in base 5 
20030216 

Lori pose la question : I'm trying to help my 6th grader with converting numbers like 82 to base 5 and 182 to base 12. We saw your examples on 613, but still are confused. Penny Nom lui répond. 





A rectangular prism 
20030109 

Julie pose la question : How many faces on a rectangular prism and how many bases? Can the base also be a face and can a face also be a base? Diane Hanson lui répond. 





Jimmy's hits 
20021027 

Patty pose la question : One seventh of Jimmy's hits were doubles 12.5% of his hits were homeruns Jimmy had 82 singles He did not have any triples
How many hits did Jimmy have? (Be sure to include the equation that represents the number of hits) Penny Nom lui répond. 





Baseball, basketball and football 
20021008 

Debbie pose la question : The school newspaper is interviewing 6th grade students to see what sports they follow regularly on TV. Of the 70 students interviewed; 40 enjoyed basketball; 40 enjoyed baseball; 40 enjoyed football; 20 enjoyed basketball and football; 22 enjoyed baseball and basketball; 27 enjoyed football and baseball; and 12 enjoyed all three sports. How many students out of the 70 interviewed didn't follow any one of the three sports? Leeanne Boehm, Penny Nom and Walter Whiteley lui répond. 





Base 5 numbers 
20020913 

Vera pose la question : ? how do you change a base 10 number to base 5 Penny Nom lui répond. 





Baseball and sit ups 
20020131 

A student pose la question : A baseball team won 8 more games than it lost. If it played 56 games, how many games did it win? On the first day of practice, Paul did 3 sit ups. On the second day he did 5, and on the the third day he did 8, and on the fourth day he did 12. If this pattern continued, how many situps did ihe do on the sixth day of practice? Penny Nom lui répond. 





Papy's Computer 
20020111 

MaryAnne pose la question : My secondgrade son brought home a fun math worksheet which involved calculating sums using "Papy's Computer." I had never heard of this before and found it to be quite interesting. Each digit in a decimal number is represented by a 2x2 grid. Each grid square corresponds to one of the numbers 1,2,4, or 8. Harley Weston lui répond. 





The best of 7 
20010908 

Michelle pose la question : Professional basketball, hockey, and baseball championships are decided on the best 4 out of 7 games. The first team to win four games wins the championship. In how many possible ways could the team win the championship series after winning the first game?
Example:
Game 1 2 3 4 5 6 7
Result W L L W W W
Leeanne Boehm lui répond. 





Arithmetic in base 5 
20000920 

Lesley Emerson pose la question : my daughter is 9 and has been aske to solve the following in base 5 3+2 4+10 . . . Penny Nom lui répond. 





Two calculus problems 
20000501 

Kaushal Shah pose la question : How Do WE Integrate the following Functions,  Integral xtanx dx
 How was natural base "e" discovered and why e=2.7.......
Claude Tardif lui répond. 





Paying with silver 
20000426 

Luther Jackson pose la question : A silver prospector is unable to pay his March rent in advance. He owned a bar of pure silver, 31 inches long, so he made the following arrangement with his landlady. He would cut the bar, he said into smaller pieces. On the first day of March he would give her and inch of the bar, and on each succeeding day he would add another inch to her amount of silver. She would keep this silver as security. At the end of the month, when the prospector expected to be able to pay his rent in full, she would return the pieces to him. . . . Claude Tardif and Penny Nom lui répond. 





Play ball 
20000203 

Jessie pose la question : Here's a calc question that is probably a lot easier than I am making it. If you have a legendary "baseball problem" for the related rates section of Calc I, and you are given that the runner is running from 2nd to 3rd base at a given rate, and the umpire is standing at home plate, and you are given the distance between the bases on the field, how do you find the rate of change of the angle between the third base line (from the point of the umpire) and the runner? Here is a sample prob: Runner is moving from 2nd to 3rd base at a rate of 24 feet per second. Distance between the bases is 90 feet. What is the rate of change for the angle (theta, as described previously) when the runner is 30 feet from 3rd base? Harley Weston lui répond. 





.400 in Baseball 
19991215 

Nieve Nielson pose la question : I have several questions to ask about the probability of getting a .400 in baseball:  What is the probability of a baseball player hitting a .400 in one game, considering that the hitter is up to bat four times?
 What is the probability of a baseball player hitting a .400 in a season, considering that there are 100 games in a season? With the first two questions in mind:
 Considering that baseball has been around for about 100 years, about how many people should hit .400 inthat time?
Chris Fisher lui répond. 





Bases other than 10 
19991206 

Garret Magin pose la question : We are doing a lesson on numbers of other bases than 10. We are working with binary, octal, and Hexadecimal. I was wondering what is used to represent number of different bases other then 16? Does it just continue on with the alphabet and if so what happens when you get to Z. It would be a help if you could answer this because it is really bugging me. And none of the math teachers at my school could let me know. Claude Tardif and Patrick Maidorn lui répond. 





Selecting some players 
19991120 

Korbin Brown pose la question : Roger Craig, during his term as team manager of the San Francisco Giants, received a strange communication from the team general manager, Al Rosen. Mr. Rosen told him to select 25 players according to this formula: 1/2 of the team had to be outfielders and infielders 1/4 of the team had to be starting pitchers 1/6 of the team had to be relief pitchers 1/8 of the team had to be catchers Roger was a bit confused by Al's request, yet complied anyway. How did he do it? Claude Tardif lui répond. 





A Weighty Problem 
19990617 

A parent pose la question : When using a balance scale, weights can be placed on either side of the scale. For example, if a 10 pound weight provides a counter balance to an object and a 7 pound weight, then the object must weigh 3 pounds. What four weights can be used to weigh objects of 1, 2, 3 ... 38, 39, 40 pounds? Penny Nom lui répond. 





Base 2 to Base 10, conversion, convert 
19990508 

Larry Bader pose la question : 10100011_{2} is the same as what number in Base ten? a. 83 b. 128 c. 93 d. 326 e. 163 Penny Nom lui répond. 





Place Value 
19990105 

Reg pose la question : I work in a Section 27 classroom with various grades. I am looking for assistance on how to deliver a lesson on place value:decimal numbers keeping in mind that they need to see it (visual) to comprehend. I am looking for grade 46 level. Jack LeSage lui répond. 





Converting to other bases 
19960206 

Paul pose la question : Converting base 10 numbers to other bases Penny Nom lui répond. 

