







calcul des hh,mn,sec 
20080119 

gillot pose la question : bonjour, mon fils à des additions et soustractions d'horaire et je n'arrive pas à trouver
la règle pour lui espliquer comment il faut faire
il y a t il une formule pour les additions et soustractions
merci par avance pour vos réponses Claude Tardif lui répond. 





A=B+C+D+F+G+H+J 
20071127 

Boubendir pose la question : voila ma question et comme savoir les nombres additioné en etulisant le resultat
A=B+C+D+F+G+H+J
au debut ons a les B,C,D,F,G,H,J on connaissent leur valeur comment retrouver
valeur on etulisant leur resultat Claude Tardif lui répond. 





Gauss' Addition of whole numbers. 
20180430 

Brad pose la question : I found this on your site. Question: what is the sum of the first 100 whole numbers??
Is there a different formula if the numbers begin at a number other than one? For example
What is the series I want to add is goes from 7  53? Harley Weston lui répond. 





Adding two negatives 
20180204 

Pinasshakoane pose la question : (23)+(3) Penny Nom lui répond. 





Adding fractions 
20171027 

Sandy pose la question : virinchi distributed 4/7 of cake to his friends 1/3 of it to his family members which part of cake is remaining? Penny Nom lui répond. 





Multiplication and repeated addition 
20161123 

Anandmay pose la question : Hello
I was looking closely at early arithmetic where I found how we discovered properties of Arithmetic.
Like:2 x 3 = 3 x 2.
This can be proved by considering a 2D figure(actually,quadrilateral) having length consisting of 2 boxes of
1by1 dimensions and breadth of 3 boxes of the same dimensions.
Now,consider it again,but,this time,length of 3,and breadth of 2 of such 1 by 1 boxes.
We now notice that we can fit the 2 types of rectangles formed on each other precisely.
So the multiplicative property of commutativity is true for all natural numbers as we can generalize the result(in our mind,for self satisfaction).
Now,can you find me a nice satisfactory reason of why a fraction times a natural number equals the number times the fraction?
I mean, for example,i can understand the meaning of 3 x 2/3 to be three times 23rd,that is, 2/3+2/3+2/3.Fair enough.
But here is the problem:By definition and actual meaning of multiplication, a x b means the repeated sum of b,done 'a' times.
So what is the meaning of doing 2/3 x 3?The repeated addition of 3 how many times??2/3 times??Not making sense,right?And even
we have not proved yet the commutative property of numbers INCLUDING fractions.So how can we resolve this problem and make these things meaningful?
Thanks Penny Nom lui répond. 





find f+g 
20160626 

yzabelle pose la question : find f+g
f(x)=x^21
g(x)=square root of x+2 Penny Nom lui répond. 





Fractions of two quantities 
20160122 

Melody pose la question : Kate ate 1/4 of her orange. Ben ate 2/4 of his banana. Did Kate and Ben eat 3/4 of theit fruit? Explain. Penny Nom lui répond. 





Complex numbers in standard form 
20160115 

Michael pose la question : express the following complex numbers in standard form (2+3i)+(52i) Penny Nom lui répond. 





A ladder against a wall 
20140709 

thabo pose la question : A ladder 6.5m long,leans against a wall so that the top of the ladder is 4.8m from the ground.what is the angle of elevation of the ladder to the top of the wall Penny Nom lui répond. 





Adding fractions 
20140131 

bianco pose la question : 2/3+3/4=
9/86/8= Penny Nom lui répond. 





A word problem involving fractions 
20140123 

Pamela pose la question : John put 1/4 of his flowers in a vase
He gave 1/2 to of the flower to his wife
He gave 1/5 of the flowers to his daughter
He has 8 flowers left
How many flowers did John start with Penny Nom lui répond. 





Why can't we add or subtract speed? 
20131121 

kashish pose la question : why we cannot add or subtract "speed" / directly in any given distance , speed , time questions? Chris Fisher lui répond. 





Adding mixed numbers 
20131120 

Kathy pose la question : 1 3/4 + 1 2/3= ?
5 1/2  2 5/6= ? Penny Nom lui répond. 





Group the addends so that you can add mentally 
20131001 

monica pose la question : the questions in the homework says change the order or group the addends so that you can add mentally ,find the sum and tell which property you used
120+37+280 and 25+25+30 Penny Nom lui répond. 





Ann has a bag of marbles. 
20130725 

Carmen pose la question : Ann has a bag of marbles. she gave one half to her friend Tina and then one third to her friend Tom. Now left with 15. How many did she had originally? Robert Dawson and Penny Nom lui répond. 





Cutting three sections of pipe 
20130516 

Michael pose la question : A plumber cuts three sections of pipe from a 12’ length of ABS pipe, the lengths of the sections
are 33 3/8”, 56 5/8” and 39 7/8”. What is left over from the full length, if the saw cut is 1/8”
wide? Penny Nom lui répond. 





Adding two fractions 
20120919 

jeanette pose la question :
Question from jeanette, a parent:
can you help me figure this according to BEDMAS I am lost
steps please:
\[\frac{12.75^2}{50} + \frac{13.49^2}{60}\]
I hope this is not too confusing for you it is to me... Harley Weston lui répond. 





Adding more than 2 fractions 
20120910 

Anonymous pose la question : How do you add or subtract more than 2 integer fractions?
OK, here is an example.
5/6 + 7/4 + 13/8
Please tell me the steps.
Thanks grade 9 student Robert Dawson and Penny Nom lui répond. 





Adding speeds 
20120826 

Roy pose la question : May I ask if it is correct to add the following with units included? Some tell me that the units cannot be included in the addition because we cannot add speed. Harley Weston lui répond. 





Adding fractions 
20120105 

laurie pose la question : if shaded parts of a circle are 4/7 and the other is 1/3 what fraction is left Penny Nom lui répond. 





1 third plus 5 sixths 
20111110 

Matt pose la question : 1 third plus 5 sixths = Penny Nom lui répond. 





pi/2 + 12/13 
20110524 

Jen pose la question : If you have (pi/2) and you want to add it to (12/13), how would you go about it? Chris Fisher lui répond. 





Multiplication and order 
20110121 

Janet pose la question : IN A MULTIPLICATION SENTENCE BASED ON A DRAWING..IS THERE ANY ORDER FOR THE MULTIPLICAND ANG MULTIPLIER FOR THE ANSWER TO RIGHT? Robert Dawson lui répond. 





1/a^2 + 1/b^2 
20110119 

robert pose la question : If (a + b)^2 = 81 and ab = 18, find the value of 1/a^2 + 1/b^2 ? Penny Nom lui répond. 





Convert to multiplication 
20101023 

angelina pose la question : how to covert 5+5+5=15 to multiplication Penny Nom lui répond. 





4.5 PLUS 29 
20100907 

kiona pose la question : 4.5 PLUS 29 Penny Nom lui répond. 





A ladder against a wall 
20100325 

amber pose la question : the distance from the bottom of the ladder to the building is18 foot less than the length of the ladder.How high up the building is the top of the ladder if that distance is 1 ft less than the length of the ladder? Penny Nom lui répond. 





A 6m ladder is placed against a wall 
20100309 

Trevor pose la question : A 6m ladder is placed against a wall making a 56 degree angle with the ground. How far up the wall does the ladder reach? Harley Weston lui répond. 





A 25 foot ladder reaches a window 20 feet high 
20100227 

Tanner pose la question : a 25 foot ladder reaches a window 20 feet high. how far is the ladder from the building? how far must the foot of the ladder be moved to lower the top of the ladder by four feet? Tyler Wood lui répond. 





Least common denominator 
20100213 

Priscila pose la question : 3/8 + 4/5 + 7/3 + 9/10 = ?
Thank you for your assistance.
Priscila Penny Nom lui répond. 





Combining fractions 
20100210 

Nick pose la question : Combine the fractions
2m/t + 5/mt Penny Nom lui répond. 





Ladder Leaning on a Wall 
20090514 

clinton pose la question : a ladder rests against a wall 24m high.the foot of the ladder is 7m from the foot of the wall. How do you calculate the length of the ladder Robert Dawson lui répond. 





A ladder against a wall 
20090408 

Jessica pose la question : The angle of elevation of a 15 ft. ladder is 70 degrees, find out how far the base of the ladder if from the wall. Penny Nom lui répond. 





A five game average of 148 
20090401 

Shelly pose la question : (128 + 145 + 139 + 157 + x) divided by 5 = 148 matches the situation stated below:
A person bowled four games and scored 128, 145, 139, and 157. Find x, the score the person would need to have in the fifth game to average 148 for all five games.
How do I solve this and how am I supposed to add x like it says in the equation? Penny Nom lui répond. 





The length of a ladder 
20090330 

Susan pose la question : The foot of an extension ladder is 7 ft. from a wall. The height that the ladder reaches on the wall and the length of the ladder are consecutive integers. How long is the ladder? 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. 





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. 





Averaging percentages 
20090221 

Chris pose la question : Ok I'll give you a simple example of what I'm doing. Lets say that on one forum, a memebr has made 52 posts out of the 412 posts made altogether. Then on another forum, the same person has made 10 posts out of the 60 posts altogether. What percentage of the posts has this person made in these 2 fourms combined. Robert Dawson and Harley Weston lui répond. 





Adding fractions 
20080917 

amanpreet pose la question : please can you help me to simplify:
2(c3) / 7 + 3(4c2)/2 Penny Nom lui répond. 





Three addends that sum to ten 
20080913 

Alfred pose la question : How many probabilities are there to have 3 addends to get a sum of 10? What is the formula? Harley Weston lui répond. 





Grouping addends 
20080913 

juan pose la question : how do you group the addends then find the sum: 2+4+6= Penny Nom lui répond. 





How far is the ladder from the wall? 
20080710 

Al pose la question : a ladder is leaning against a wall at a 70 degree angle and the ladder is 20 feet tall...how far away is the ladder from the wall Penny Nom lui répond. 





.9 repeating plus .2 repeating 
20080610 

megan pose la question : How do you express the addition of .9 repeating plus .2 repeating? Penny Nom lui répond. 





How do you add decimals? 
20080605 

nyheashiacurry pose la question : how do you add up decimals? Janice Cotcher lui répond. 





3 radical 48 +11 radical 75 
20080524 

Maria pose la question : Add 3 radical 48 +11 radical 75. Write answer in simpliest form. Penny Nom lui répond. 





Adding rational functions 
20080429 

Jonathon pose la question : 1/(x+3) + 1/(x^2+5x+6) = Penny Nom 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. 





Sum and difference of cubes 
20080130 

Amanda pose la question : It has been a really long time since I was in Algebra and I can't remember how to factor cubes such as x^3 +81 or subtracting/adding fractions with variables such as [1/(x+h)+2][1/x+2]. Please help!!! Penny Nom lui répond. 





Adding fractions 
20071231 

Lisa pose la question : As an educator in Adult Education, I am preparing a young man for a US Government test. The equation I have trouble with is explaining the following equation. It asks: If it takes A 3 days to dig a certain ditch, whereas b can dig it in 6 days, and C in 12, how long would it take all three to do the job? I know the equation is 1/3 + 1/6 + 1/12 and it equals = 7/12 but I don't understand how it equals 7/12. This simple math eludes me. So the question is not the final answer of 1 and 5/7 of days but where one comes up with the 7/12? Penny Nom and Claude Tardif lui répond. 





Percentage increase in profit 
20071204 

Dee pose la question : If I had a certain % increase in profits for the entire year, why can't I add the profits I made for the first 1/2 of the year to the profit I made in the second 1/2 of the year to get the total year end profit percentage? Or how can I compare the increase/decrease for each 1/2 of the year to the total % increase/decrease? Penny Nom lui répond. 





Addends 
20071127 

jessica pose la question : what is a addends my son needs to write a number sentence that has two addends that are the same Stephen La Rocque lui répond. 





Number sentences 
20070915 

jen pose la question : list the addition number sentences that can be written using two sets of cards with the numbers 5 6 and 7. which number sentences have the same addends but show a different order?,,,,,,,,,,,,,,Ithis is for my son in 3rd grade and for the life of us we can't figure it out,,thanks for this elementary help Harley Weston lui répond. 





Adding algebraic fractions 
20070814 

John pose la question : Ive completely forgot anything to do with the subject mentioned, so my question is straight to the point..
I need to know how to do the following problem (Preferably do not give me an answer though)
(k/3k8)  (4/k+2) Penny Nom lui répond. 





Fractions of fractions 
20070718 

Bridget pose la question : Sam and Mary each owned onehalf stock in a printing company. Sam sold 2/3 of his stock to Mary. What fractional part of the printing business does Mary now own? Penny Nom lui répond. 





Period of a sum of trig functions 
20070617 

Aakash pose la question : the period of the function f(x)=cos3x+sin4x+tan4x Stephen La Rocque lui répond. 





How high does the ladder reach? 
20070611 

Madi pose la question : A ladder 8 ft long resting on a house makes a 60 degree angle with the ground. how far up the house does it reach? Stephen La Rocque lui répond. 





Linear systems 
20060921 

Alexander pose la question : Hello, i have a math assignment due tonight at midnight and i need some help please
It is using the addition method to solve linear systems Penny lui répond. 





1/x + 1/y 
20060811 

Sonya pose la question : what is 1/x+1/y = ? is it equal to 1/x+y or what? Penny Nom lui répond. 





Rate of ladder falling 
20060430 

Harsh pose la question : A ladder 4 m long rests against a vertical wall. If the bottom of the ladder slides away from the wall at a speed of 30 cm/s, how quickly is the top of the ladder sliding down the wall when the bottom of the ladder is 2 m from the wall? Stephen La Rocque lui répond. 





Adding polynomials and counting the terms 
20060428 

Kris pose la question : Suppose that two polynomials, each containing 3 terms, are added. Is it possible for the sum to contain more than 3 terms? fewer than 3 terms? exactly 3 terms? Explain. Leeanne Boehm and Steve La Rocque lui répond. 





Ladder and wall 
20060427 

Lori pose la question : A 12foot ladder is leaning across a fence and is touching a higher wall located 3 feet behind the fence. The ladder makes an angle of 60 degrees with the ground. Find the distance from the base of the ladder to the bottom of the fence. Stephen La Rocque lui répond. 





Adding consecutive numbers 
20060426 

Lisa pose la question : When I have a total that is the sum of consecutive numbers, how do I figure out what the numbers are?
Stephen La Rocque lui répond. 





Adding with mixed fractions 
20060330 

Becca pose la question :
can anyone help with how we change to get the same denominator with adding whole number.
example:8+7 3/8
6 1/2 + 2 5/6
Stephen La Rocque lui répond. 





Adding fractions 
20060326 

Barbara pose la question : I know that to subtract 1/4 from 2/3 I must find a common denom. Now the 2/3 becomes 8/12.....i understand the 12, but where does the 8 come from? Penny Nom lui répond. 





A 25 foot ladder is leaning against a building. 
20060324 

Ali pose la question : A 25 foot ladder is leaning against a building. The base of the ladder is 7 feet from the building. How high up the building does the ladder reach? Stephen La Rocque lui répond. 





Daddy Warbucks' cash 
20060222 

Grace pose la question : Daddy Warbucks always carries a specific number of $100 and $500 bills for impulse purchases and $1 bills for tips. If he has 500 bills in his briefcase and they total $50,000, how many bills of each denomination does he carry? Stephen La Rocque lui répond. 





GCF, LCM, primes and the ladder method 
20060107 

Linda pose la question : How would I teach both finding the GCF and LCM with prime factors...I recall the ladder method vaguely.??? Penny Nom lui répond. 





Adding 10 and multiples of tens to one and two digit numbers 
20051213 

Meghan pose la question : I am teaching in a grade 2/3 class and I am struggling with trying to find a simple way of explaining to the students how to add 10 and multiples of tens to one and two digit numbers. Diane Hanson lui répond. 





Adding improper fractions 
20051125 

Paula pose la question : I would like a simple step by step explanation on how to add improper fractions. Penny Nom lui répond. 





How to add three addends 
20050928 

Patricia pose la question :
explaination of how to add three addends if you use a double to add or if you use a sum of 10
8+3+2=
6+4+0=
3+3+6=
2+5+4=
Baul Betts and Penny Nom lui répond. 





The language of subtraction 
20050926 

Chris pose la question : When you have an addition problem you have two addends that equal a sum. Therefore . . .
I know the answer to a subtraction problem is the difference  what is the name of the numbers that make up a subtraction problem? Diane Hanson and Harley Weston lui répond. 





Adding positive and negative numbers 
20050903 

Billy pose la question : 46 + 24 =
38 + 22 =
19  20 = Penny Nom lui répond. 





Adding consecutive integers 
20050513 

Yas pose la question : i need some help with my work which is to investigating sums of consecutive numbers for example: 15= 4+5+6 and 15=1+2+3+4+5 Penny Nom lui répond. 





The least common denominator 
20041103 

A student pose la question : Write the LCD for each pair of fractions.
13. 1/3,1/5
14. 2/7,1/4
15. 3/4,3/5 Penny Nom lui répond. 





Subtracting fractions 
20040511 

Filipe pose la question : Question:
_5_  __7__
6ab 8a Penny Nom lui répond. 





A/30 + B/105 = (7A + 2B)/x 
20040205 

Jim pose la question : If A/30 + B/105 = (7A + 2B)/x and A, B, and x are integers greater than 1, what must x equal? Penny Nom lui répond. 





Adding percentages 
20031219 

Paula pose la question :
How do you add percentages
e.g 90% + 80% + 60% + 54% + 25% = ?
Penny Nom lui répond. 





Adding fractions 
20031116 

Ken pose la question : My name is Ken and I am taking my GED course for my High School and have not been in a class for 35 years. I am doing this for retraining. I am at the part about fractions. Here is an example that I am having trouble with.
1 3/7 + 4 2/3 + 11/21
They have no common denominators. Could you PLEASE help me. If you could send me a step by step explanation it would be greatly appreciated. Penny Nom lui répond. 





A 16 foot ladder 
20030904 

Kelly pose la question : Two buildings are separated by a threefoot alleyway. Fatima wants to use a 16 foot ladder to reach a window in the wall of one of these buildings. If she places the foot of the ladder against the base of the other building, how far up the wall will the top of the ladder reach?? Penny Nom lui répond. 





7+8+9+...+1000 
20020911 

Shirley pose la question : My question is what is the formula for adding up numbers when you don't start with number 1? For example 3 + 4 + 5 + 6 = 18. But how could you arrive at the answer without adding all the numbers? Penny Nom lui répond. 





Common Denominator 
20020826 

Slobodanka pose la question : What is a Common Denominator? Penny Nom lui répond. 





Adding algebraic fractions 
20020320 

Dolores pose la question : I get totally confused with this problem. I get confused with the getting the lowest terms. 4/x5 + 2/x 10/x^25x Penny Nom lui répond. 





F = 3 + 3 
20020319 

Jessica pose la question : F= 3 + 3 WHAT IS F????? Penny Nom lui répond. 





Adding algebraic fractions 
20020123 

Francine pose la question :
Hello, I've come up with an answer for the following problem but it's not the same as the book's answer. However, the book has a lot of mistakes in it and I don't know if I'm doing it properly or not. Your help would be soooo appreciated. It's driving me crazy.The problem is:
2 + 3 + 4
 +  + 
(x1)^3 (x1)^2 (x1)
[(x1)^3 is (x1) to power of 3 etc.] Penny Nom lui répond. 





Adding vectors 
20020112 

Lena pose la question : how do you add vectors together? If you are given the length and angles of both vectors and are asked to add/subtract them, how do you do it? I know you are supposed to do the head to tail method, but whenever i try it i get the wrong answer. I need help setting it up. example: A is 2.7cm, and 60 degrees, B is 1.6cm and 135 degrees, find the magnitude and amplitude Penny Nom lui répond. 





Odd plus even is odd 
20011014 

James pose la question : Why is the sum of an odd number and an even number always odd? Peny Nom lui répond. 





Adding and subtracting rational expressions 
20010503 

Donna pose la question : Adding and subtracting Rational expressions. I am in grade 10 and I am a student here is an example of the questions: 1/(x+1)  1/(x1) = ? Penny Nom lui répond. 





Adding functions 
20010219 

Jackie pose la question : f(x) = x^{2} + 1; g(x) = x^{2}  1 find a) ((f+g) of h)) (x) b) ((fg) of h)) (x) c) ((f of h)  (g of h)) (x) Penny Nom lui répond. 





What is wrong with these probelms? 
20010209 

Cindy pose la question : Hi, I am a planning on becomming a teacher and i am asked to find out what is wrong with these probelms and how i would go about showing a student what is wrong with them!! Error in patterns: 13/35=1/5; 27/73=2/3; 16/64=1/4 4/5+2/3=6/8; 2/5+3/4=5/9; 7/8+1/3=8/11 2/3*3=6/9; 1/4*6=6/24; 4/5*2=8/10 Leeanne Boehm and Penny Nom lui répond. 





Order of operations 
20001126 

Margaret Pratt pose la question : My daughter has a math question and I am afraid I am of no help. Can you help? 2x5/2+15= She arrives at 8 as the answer and has been told this is incorrect. Any help you can give would be appreciated. Penny Nom lui répond. 





Word addition 
20000705 

Harman Chaudhry pose la question : What is the value of DISHES if SEE + THE + WAITER + WASHES = DISHES. In addition, I know there is a name for these types of problemswhat are they actually called? Chris Fisher lui répond. 





Why does division start from the left? 
20000524 

Salil Dave pose la question : Addition, subtraction and multiplications start with right most digit and proceed left, but division starts from leftmost digits and goes right ... why? Harley Weston lui répond. 





Adding fractions 
20000423 

A grade 6 student pose la question : In adding fractions, how do I rewrite the fractions so that the denominators are equal? The problem is 3/4 + 1/6 = The other problem is 11/18 + 4/9 = Penny Nom lui répond. 





Making fruit salad 
20000329 

A grade 5 student pose la question : Miss.Muffet males a fruit salad by adding 31/2 pounds of grapes and 4 1/4 pounds of apples to every 2 1/4 pounds of melon. How many pounds of grapes does she use in 50 pounds of fruit salad? Claude Tardif lui répond. 





Addition 
20000111 

Deanna pose la question : what is the answer for 20+5+323+98 Penny Nom lui répond. 





The shortest ladder 
19990626 

Nicholas pose la question : A vertical wall, 2.7m high, runs parallel to the wall of a house and is at a horizontal distance of 6.4m from the house. An extending ladder is placed to rest on the top B of the wall with one end C against the house and the other end, A, resting on horizontal ground. The points A, B, and C are in a vertical plane at right angles to the wall and the ladder makes an angle@, where 0<@ Harley Weston lui répond. 





A ladder problem 
19990422 

Michael Blade pose la question : There is a cube box 3feet x 3feet x 3ft resting against a vertical wall on level ground. Resting against the outside corner of the box is a ladder 10 feet tall, this ladder is of course resting on the ground but also against the outside corner of the box and rests on the wall. The question the ladder is divided into two unequal section bounded by the box to the ground and the box to the wall. what are those dimensions? Penny Nom lui répond. 





A number between 
19981125 

Jimmy Nikola pose la question : A number is less than 3,425 + 8,630 and greater than 7,614 + 4,429. What could the number be? This question is on page 93, question number 23. in Silver Burdett Ginn Math book, which is a 3rd grade math book. Jack LeSage lui répond. 





Adding Fractions 
19981015 

Lindsay pose la question : please help me!!!! Harley Weston lui répond. 





A Sum or Product of Fractions 
19981006 

Emily Robb pose la question : Find a pair of fractions that when they are multiplyed and added the sum /product is the same Penny Nom lui répond. 





Adding Fractions 
19981003 

Pam Bailey pose la question : Can you help me simplfy this? (1/2a + 1/3b)  (1/4a  1/5b) + (1/6a  1/7) thanx Harley Weston lui répond. 





Using your fingers 
19980421 

Ian Sutherland pose la question : My 7yearold son, in Grade 2, constantly uses his fingers to count. I know for now this is a useful crutch but at what point should he stop? Diane Hanson lui répond. 

