46 items are filed under this topic.
 |
|
|
|
|
|
|
|
|
Two pieces of rope |
2016-05-21 |
|
From Render:
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.
Answered by Penny Nom. |
|
|
|
|
|
|
60% as much as $30. |
2014-07-18 |
|
From Kenneth:
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.
Answered by Robert Dawson. |
|
|
|
|
|
|
Problem solving with fractions |
2013-12-03 |
|
From Jennie:
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?
Answered by Penny Nom. |
|
|
|
|
|
|
Multiplication in base two |
2013-02-01 |
|
From Michael:
multiply in the indicated base
110two*11two
Answered by Penny Nom. |
|
|
|
|
|
|
birdhouse in the shape of a rectangular prism |
2012-10-29 |
|
From Tiffany:
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?
Answered by Robert Dawson. |
|
|
|
|
|
|
Changing the sign of an inequality |
2012-09-19 |
|
From Bryauna:
Why do you change the signs in inequalities?!
Answered by Penny Nom. |
|
|
|
|
|
|
Multiplying binomials |
2012-05-14 |
|
From Jordan:
How do I solve the equation:
3(x+4)(x-6)
Answered by Penny Nom. |
|
|
|
|
|
|
3.8 x 2.2 |
2011-08-18 |
|
From Isaac:
Question from isaac, a student: I am struggling in math & I need help on multiplying 3.8 x 2.2. Can you helpme
Answered by Melanie Tyrer and Harley Weston. |
|
|
|
|
|
|
Multiplying in different bases |
2009-02-25 |
|
From Susan:
11 base 2 X 22 base 3 + 33 base 4 = _________ base 5
Answered by Robert Dawson. |
|
|
|
|
|
|
mutiplying decimals |
2009-02-24 |
|
From telly:
how to do this sum0.24*0.398
Answered by Robert Dawson and Penny Nom. |
|
|
|
|
|
|
Multiplying negative numbers |
2009-01-15 |
|
From stephanie:
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.
Answered by Harley Weston. |
|
|
|
|
|
|
What fraction of 45 is 10? |
2008-04-06 |
|
From Scott:
45 x fraction? = 10
Answered by Penny Nom. |
|
|
|
|
|
|
Multiplying decimal numbers |
2008-02-05 |
|
From alwyn:
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 !!
Answered by Stephen La Rocque and Penny Nom. |
|
|
|
|
|
|
Fractions of fractions |
2007-07-18 |
|
From Bridget:
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?
Answered by Penny Nom. |
|
|
|
|
|
|
Comparing two fractions |
2007-01-18 |
|
From Kayla:
Why does eight over twelve compared to one half work when you use cross multiplication.
Answered by Penny Nom. |
|
|
|
|
|
|
Products with symbols |
2007-01-09 |
|
From Jennifer:
Find the product of each
(8x)(-4)
(3x)(5y)(7z)
(8x^3y)-5X^2)
(6a)(3a)(-b^2)
Answered by Penny Nom. |
|
|
|
|
|
|
A 15% tip |
2006-12-06 |
|
From Danielle:
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?
Answered by Penny Nom. |
|
|
|
|
|
|
Multiplying two algebraic fractions |
2004-10-31 |
|
From A parent:
Multiply:
x+2 x²-4
----- x -------
x-2 x²+x-2
Answered by Harley Weston. |
|
|
|
|
|
|
The least common denominator |
2003-01-21 |
|
From Brittan:
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
Answered by Penny Nom. |
|
|
|
|
|
|
Multiplying decimals |
2002-03-10 |
|
From Kaitlin:
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.
Answered by Penny Nom. |
|
|
|
|
|
|
Negative times negative is positive |
2001-10-26 |
|
From Mary:
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?
Answered by Penny Nom. |
|
|
|
|
|
|
Why do you flip the inequality sign? |
2001-10-26 |
|
From Sean:
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.
Answered by Penny Nom. |
|
|
|
|
|
|
Multiplying vectors |
2001-10-22 |
|
From Murray:
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)
Answered by Harley Weston. |
|
|
|
|
|
|
Multiplying binomials |
2001-09-08 |
|
From A student:
(x+1)(x+2)=?
(2x-1)(x-4)=0
please tell me this question!!
Answered by Leeanne Boehm. |
|
|
|
|
|
|
Conformable matrices |
2001-08-05 |
|
From Wayne:
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!
Answered by Steve Kirkland. |
|
|
|
|
|
|
Multiplication |
2001-05-30 |
|
From Lindsay:
Who came up with multipling? its so easy
Answered by Claude Tardif and Penny Nom. |
|
|
|
|
|
|
Multiplying one and two digit numbers |
2001-02-11 |
|
From Marty:
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?
Answered by Penny Nom. |
|
|
|
|
|
|
What is wrong with these probelms? |
2001-02-09 |
|
From Cindy:
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
Answered by Leeanne Boehm and Penny Nom. |
|
|
|
|
|
|
(-2b+3)(-b-1) |
2001-02-06 |
|
From Melissa:
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?
Answered by Penny Nom. |
|
|
|
|
|
|
Fractions of fractions |
2001-01-30 |
|
From Katie:
When you multiply two positive fractions less than 1, how does the answer compare to the size of the fraction? Why?
Answered by Penny Nom. |
|
|
|
|
|
|
7x6 by doubling |
2001-01-23 |
|
From A student:
Can you think of a way to use doubling to multiply 6x7?
Answered by Allen Herman. |
|
|
|
|
|
|
Multiplication of fractions |
2001-01-08 |
|
From Angela:
Questions:
1. represent multiplication of fractions via an area model 2. describe why, not just how, to round decimals
Answered by Penny Nom. |
|
|
|
|
|
|
Dividing fractions |
2000-10-18 |
|
From Paula:
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?
Answered by Penny Nom. |
|
|
|
|
|
|
Multiplying decimals |
2000-10-16 |
|
From Lily:
I need help with mutiplying decimals (example) 2.28*0.48( * = times).
Answered by Harley Weston. |
|
|
|
|
|
|
Multiplying fractions |
2000-05-14 |
|
From A student:
75/2 x 1/100 = 3/8 Please show how to came up with the answer?
Answered by Penny Nom. |
|
|
|
|
|
|
Star-multiplication |
2000-04-07 |
|
From Greg Potts:
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 =?
Answered by Penny Nom. |
|
|
|
|
|
|
Cross multiplication |
2000-02-16 |
|
From J E Swinton:
Why does cross multiplication work? How come canceling work?
Answered by Penny Nom. |
|
|
|
|
|
|
order 4+ determinants |
1999-12-06 |
|
From Joe Kron:
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.
Answered by Walter Whiteley. |
|
|
|
|
|
|
Invert and multiply |
1999-08-28 |
|
From Debbie Walter:
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?
Answered by Penny Nom. |
|
|
|
|
|
|
Roman Numerals |
1999-04-29 |
|
From Michelle Jenkinson:
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?
Answered by Penny Nom. |
|
|
|
|
|
|
Duplation method of multiplication |
1998-11-26 |
|
From Sara Whitford:
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??
Answered by Jack LeSage and Harley Weston. |
|
|
|
|
|
|
A Number Trick |
1998-10-26 |
|
From Brenda Meagher:
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.
Answered by Harley Weston. |
|
|
|
|
|
|
Multiplying by Nine - Chismbop Style |
1998-04-27 |
|
From Noria Jones:
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...
Answered by Patrick Maidorn. |
|
|
|
|
|
|
Roman Numerals |
1997-10-31 |
|
From Mark Curts:
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
Answered by Chris Fisher. |
|
|
|
|
|
|
Priority of operations |
1996-11-04 |
|
From Wallace:
What is the answer to this problem? Let x=-2 and y=3. Evaluate 12x / 2y (if the old division sign is used).
Answered by Chris Fisher. |
|
|
|
|
|
|
(-3)x(-2) |
1995-10-25 |
|
From Azmat:
Why is (-3)x(-2) = 6?
Answered by Herley Weston and Ed Giesbrecht. |
|
|
