46 articles trouvés pour ce sujet.
 |
|
|
|
|
|
|
|
|
Two pieces of rope |
2016-05-21 |
|
Render pose la question :
Fred cuts a 12- inch piece of rope. Then he cuts a second piece of rope that is 3/2 longer than the first piece. Is the second piece shorter or longer than the first piece? Explain.
Penny Nom lui répond. |
|
|
|
|
|
|
60% as much as $30. |
2014-07-18 |
|
Kenneth pose la question :
Question from Kenneth:
Hello:
Do you know why some "as...as" phrases indicate multiplication?
For example, ? is 60% as much as $30. This is equivalent to 60% X $30 = $18. How does this make sense?
I saw this example in an old textbook on business mathematics, but the author did not explain why it is equivalent
to multiplication.
I thank you for your reply.
Robert Dawson lui répond. |
|
|
|
|
|
|
Problem solving with fractions |
2013-12-03 |
|
Jennie pose la question :
Paul has 2/3 as many postcards as Shawn. Shawn has 3/5 as many postcards as Tim.
If the 3 boys have 280 postcards, how many more postcards does Tim have than Paul?
Penny Nom lui répond. |
|
|
|
|
|
|
Multiplication in base two |
2013-02-01 |
|
Michael pose la question :
multiply in the indicated base
110two*11two
Penny Nom lui répond. |
|
|
|
|
|
|
birdhouse in the shape of a rectangular prism |
2012-10-29 |
|
Tiffany pose la question :
Hello, I am Tiff M. from NYC.
I was solving a math problem about adding,subtracting,multiplying
or dividing fractions and mixed numbers. I am not getting this
question below.
* Laura is building a birdhouse in the shape of a rectangular prism.
The base of the birdhouse has an area of 5 square inches. The
height of the birdhouse is 2 7/12 inches. Laura calculated the
volume of the bird house to be 10 7/12in. Is she correct?
If not, what did she do wrong?
Robert Dawson lui répond. |
|
|
|
|
|
|
Changing the sign of an inequality |
2012-09-19 |
|
Bryauna pose la question :
Why do you change the signs in inequalities?!
Penny Nom lui répond. |
|
|
|
|
|
|
Multiplying binomials |
2012-05-14 |
|
Jordan pose la question :
How do I solve the equation:
3(x+4)(x-6)
Penny Nom lui répond. |
|
|
|
|
|
|
3.8 x 2.2 |
2011-08-18 |
|
Isaac pose la question :
Question from isaac, a student: I am struggling in math & I need help on multiplying 3.8 x 2.2. Can you helpme
Melanie Tyrer and Harley Weston lui répond. |
|
|
|
|
|
|
Multiplying in different bases |
2009-02-25 |
|
Susan pose la question :
11 base 2 X 22 base 3 + 33 base 4 = _________ base 5
Robert Dawson lui répond. |
|
|
|
|
|
|
mutiplying decimals |
2009-02-24 |
|
telly pose la question :
how to do this sum0.24*0.398
Robert Dawson and Penny Nom lui répond. |
|
|
|
|
|
|
Multiplying negative numbers |
2009-01-15 |
|
stephanie pose la question :
hi, I'm currently working in a grade 8 class where the students are
learning about integers. the students were asked to find examples of how
integers are applied in real life. they were able to find aplications for:
adding and subtracting both positive and negative integers. however,
we could not find an example of where two negative integers would be
either divided or multiplied together in real life. For example: (-2)(-4)= +8.
please help.
Harley Weston lui répond. |
|
|
|
|
|
|
What fraction of 45 is 10? |
2008-04-06 |
|
Scott pose la question :
45 x fraction? = 10
Penny Nom lui répond. |
|
|
|
|
|
|
Multiplying decimal numbers |
2008-02-05 |
|
alwyn pose la question :
Why should when you Multiplying Decimal numbers is value becoming less and less? don't you think even decimal number is a quantity and in no chance when it multiplies its should become less or nil !!!
In fact all Multiplying and or adding the value will go up and only when you subtract and divide it should become less !!
Stephen La Rocque and Penny Nom lui répond. |
|
|
|
|
|
|
Fractions of fractions |
2007-07-18 |
|
Bridget pose la question :
Sam and Mary each owned one-half 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. |
|
|
|
|
|
|
Comparing two fractions |
2007-01-18 |
|
Kayla pose la question :
Why does eight over twelve compared to one half work when you use cross multiplication.
Penny Nom lui répond. |
|
|
|
|
|
|
Products with symbols |
2007-01-09 |
|
Jennifer pose la question :
Find the product of each
(8x)(-4)
(3x)(5y)(7z)
(8x^3y)-5X^2)
(6a)(3a)(-b^2)
Penny Nom lui répond. |
|
|
|
|
|
|
A 15% tip |
2006-12-06 |
|
Danielle pose la question :
When she eats at a restaurant,Viviana like to leave a 15% tip,multiplying the price of the meal by 0.15. Franklin usually leaves a 20% tip,multiplying the price by 0.20.They both round up to the nearest $0.05. How much tip would Viviana leave for a $24.85 meal?
Penny Nom lui répond. |
|
|
|
|
|
|
Multiplying two algebraic fractions |
2004-10-31 |
|
A parent pose la question :
Multiply:
x+2 x²-4
----- x -------
x-2 x²+x-2
Harley Weston lui répond. |
|
|
|
|
|
|
The least common denominator |
2003-01-21 |
|
Brittan pose la question :
Hi there I need help! My name is Brittany and i am in the 6th grade. I need help finding the least common denominator(LCD), and the book says Find the LCM of the denominators and i've done that and then it says write equivalent fractions,using the LCM as the least commonn denominator.The directions say Use the LCD to write each pair as like fractions. and the problem is 1/8 and 5/40. Could u explain how in the word u do this? Thanks a lot Brittany
Penny Nom lui répond. |
|
|
|
|
|
|
Multiplying decimals |
2002-03-10 |
|
Kaitlin pose la question :
I just recently had a test on multiplying decimals and I did not do really well on it. Only 5 kids out of 19 got a passing grade. My teacher says that she will give us a different test and we can take it again, but I'm still not sure of it. My teacher has taught me a lot and she had done a wonderful job of it but I'm just confused with where to put the decimals and stuff like that. I have a math practice workbook that I do for fun and they have nothing on decimals in it. I have checked on websites to try to find worksheets but I really couldn't find a good one. Can you please help me either give me some tips or clues or send me a worksheet.
Penny Nom lui répond. |
|
|
|
|
|
|
Negative times negative is positive |
2001-10-26 |
|
Mary pose la question :
I have a question about adding and multiplying positive and negative numbers. When we add two negative numbers the answer is negative BUT when we multiply two negative numbers the answer is positive. I don't understand. Why?
Penny Nom lui répond. |
|
|
|
|
|
|
Why do you flip the inequality sign? |
2001-10-26 |
|
Sean pose la question :
I have a question about an inequality problem. Here it is: Solve and graph 5 - 3x => 17. (=> is greater than or equal). Please tell me why you flip the inequality sign when divinding by a negative number.
Penny Nom lui répond. |
|
|
|
|
|
|
Multiplying vectors |
2001-10-22 |
|
Murray pose la question :
Could you please explain why a vector times a vector is a scalar and how to derive the formula vector a * vector b = ab cos(a,b)
Harley Weston lui répond. |
|
|
|
|
|
|
Multiplying binomials |
2001-09-08 |
|
A student pose la question :
(x+1)(x+2)=?
(2x-1)(x-4)=0
please tell me this question!!
Leeanne Boehm lui répond. |
|
|
|
|
|
|
Conformable matrices |
2001-08-05 |
|
Wayne pose la question :
Can someone explain the concept of conformable matrices in a way that is easy to understand ? One definition says to multiply matrices rows and columns must conform, ie, 5 x 3 matrix times a 3 x 5 matrix. In the next example, however a 8 x 1 matrix and a 8 x 3 matrix are said to be conformable!
Steve Kirkland lui répond. |
|
|
|
|
|
|
Multiplication |
2001-05-30 |
|
Lindsay pose la question :
Who came up with multipling? its so easy
Claude Tardif and Penny Nom lui répond. |
|
|
|
|
|
|
Multiplying one and two digit numbers |
2001-02-11 |
|
Marty pose la question :
When multiplying do you put the number you are multiplying by on the top or the bottom. Example if you are multiplying by 6's would you write the problem 6
x 2 or 2
x 6 Maybe it just doesn't matter. But when you get to double digits, the double digit always goes on the top?
Penny Nom lui répond. |
|
|
|
|
|
|
What is wrong with these probelms? |
2001-02-09 |
|
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. |
|
|
|
|
|
|
(-2b+3)(-b-1) |
2001-02-06 |
|
Melissa pose la question :
Alright, lets say you are multiplying (-2b+3)(-b-1) and you are using "FOIL" first you would get : 2b2+2b-3b-3 then you add like-terms. when multiplying,if the bases are the same, add the exponents...does the same thing apply when you are adding the results of the multiplication even though it's addition? would the answer be 2b3-3b-3 or would it be 2b2-b-3?
Penny Nom lui répond. |
|
|
|
|
|
|
Fractions of fractions |
2001-01-30 |
|
Katie pose la question :
When you multiply two positive fractions less than 1, how does the answer compare to the size of the fraction? Why?
Penny Nom lui répond. |
|
|
|
|
|
|
7x6 by doubling |
2001-01-23 |
|
A student pose la question :
Can you think of a way to use doubling to multiply 6x7?
Allen Herman lui répond. |
|
|
|
|
|
|
Multiplication of fractions |
2001-01-08 |
|
Angela pose la question :
Questions:
1. represent multiplication of fractions via an area model 2. describe why, not just how, to round decimals
Penny Nom lui répond. |
|
|
|
|
|
|
Dividing fractions |
2000-10-18 |
|
Paula pose la question :
Why do you have to change the division sign to a multiplication sign and invert the fraction that follows the division sign in order to get the answer to a division problem when you're working with fractions?
Penny Nom lui répond. |
|
|
|
|
|
|
Multiplying decimals |
2000-10-16 |
|
Lily pose la question :
I need help with mutiplying decimals (example) 2.28*0.48( * = times).
Harley Weston lui répond. |
|
|
|
|
|
|
Multiplying fractions |
2000-05-14 |
|
A student pose la question :
75/2 x 1/100 = 3/8 Please show how to came up with the answer?
Penny Nom lui répond. |
|
|
|
|
|
|
Star-multiplication |
2000-04-07 |
|
Greg Potts pose la question :
I have this question to answer and I don't know where to start. 1*9=0, 9*8=72 and 2*8=9, then 9*9 =?
Penny Nom lui répond. |
|
|
|
|
|
|
Cross multiplication |
2000-02-16 |
|
J E Swinton pose la question :
Why does cross multiplication work? How come canceling work?
Penny Nom lui répond. |
|
|
|
|
|
|
order 4+ determinants |
1999-12-06 |
|
Joe Kron pose la question :
Why is it never shown how to calculate the value of 4x4 (or larger size) deteminants by the diagonal multiply methods that are generally shown for 2x2 and 3x3 determinants? The method I'm talking about is called Cramer's Rule??? Is this method not extensible to order 4+ and if not why not? Anyway the method always shown for order 4+ is called "reduction by minors" which is not the answer to this question.
Walter Whiteley lui répond. |
|
|
|
|
|
|
Invert and multiply |
1999-08-28 |
|
Debbie Walter pose la question :
I have another question please, WHY do we invert and multiply when dividing fractions? I know that's what we do but WHY? What is the reasoning behind it?
Penny Nom lui répond. |
|
|
|
|
|
|
Roman Numerals |
1999-04-29 |
|
Michelle Jenkinson pose la question :
Someone proposed this question to me and I do not know the answer, so I was wondering if you could help. How, using Roman Numeral, did people add, subtract, multiply, and divide with no zero or negative numbers?
Penny Nom lui répond. |
|
|
|
|
|
|
Duplation method of multiplication |
1998-11-26 |
|
Sara Whitford pose la question :
I am wondering why 16 and multiples of 16 do not work in the ancient duplation method of multiplication used by the Egyptians. I discovered the method in the Journeys math text gr 7 level. Just curious. Am I doing something wrong??
Jack LeSage and Harley Weston lui répond. |
|
|
|
|
|
|
A Number Trick |
1998-10-26 |
|
Brenda Meagher pose la question :
I'm a 37 year old mother and i have returned to school for personal reasons. I was faced with this question.
Choose any number less than 10, multiply it by 8547, then take your answer and multiply it by 13. I chose the number 8. 8547
x 8
--------
68376 and 68376
x 13
---------
205128
68376
---------
888888 Any number chosen from 1 to 9 will result in the same form of answer.If the number two is used you will end up with 222,222.etc So my question is, is there another number that will results in the answers.
Harley Weston lui répond. |
|
|
|
|
|
|
Multiplying by Nine - Chismbop Style |
1998-04-27 |
|
Noria Jones pose la question :
About a year ago a grade 5 teacher at my son's school taught the children how to multiply the 9 times table on their fingers quickly. It was part of a kind of finger math kind of thing...
Patrick Maidorn lui répond. |
|
|
|
|
|
|
Roman Numerals |
1997-10-31 |
|
Mark Curts pose la question :
I am looking for some resources for teaching Roman Numerals. I would like to expand upon the basic concepts, by locating some addition, subtraction, multiplication or division problems written with Roman Numerals. --
Mark Curts
Chris Fisher lui répond. |
|
|
|
|
|
|
Priority of operations |
1996-11-04 |
|
Wallace pose la question :
What is the answer to this problem? Let x=-2 and y=3. Evaluate 12x / 2y (if the old division sign is used).
Chris Fisher lui répond. |
|
|
|
|
|
|
(-3)x(-2) |
1995-10-25 |
|
Azmat pose la question :
Why is (-3)x(-2) = 6?
Herley Weston and Ed Giesbrecht lui répond. |
|
|
