Drexel dragonThe Math ForumDonate to the Math Forum

Ask Dr. Math

Elementary Archive

Dr. Math Home || Elementary || Middle School || High School || College || Dr. Math FAQ

This page:
  multiplication checkmark

  Dr. Math

See also the
Dr. Math FAQ:
  multiplication facts
  order of operations

Internet Library:

  learning to multiply




   3D and higher

Golden Ratio/
Fibonacci Sequence



Number Sense/
About Numbers
   large numbers
   place value
   prime numbers
   square roots

Word Problems

Browse Elementary Multiplication
Stars indicate particularly interesting answers or good places to begin browsing.

Selected answers to common questions:
    Flashcards/worksheets on the Web.
    Learning to multiply.
    Least common multiple, Greatest common factor.
    Number sentences.
    Order of operations.

Russian Peasant Multiplication [11/01/1997]
What is Russian peasant multiplication?

Square Numbers [07/27/1999]
Can you explain what a square number is?

Squaring Two-Digit Numbers Ending in 5 [09/10/2001]
Take the first digit, multiply it by the next consecutive number, and place it in front of 25. Can you prove this shortcut?

Sum of Products [11/01/1999]
When a word problem refers to the sum of the products, what exactly does it mean?

The Term Power [10/23/2001]
One of my students asked how we came to use the term power to express the number of times we multiply a number by itself.

Times Greater Than, Times As Much As [05/02/1999]
A number is five times greater than x. Will this number be 6x or 5x?

To Multiply or Divide? That Is the Question. [09/02/2003]
In a story problem, how do you know whether to multiply or divide?

Using Doubling to Multiply [02/20/2002]
Can you think of a way to use doubling to multiply 6 x 7?

Using the Distributive Property [08/23/2001]
My math teacher told us to work problems like this: a(b-c)= ab-ac.

Ways to Add and Divide More Easily [11/17/2008]
I have to add 2398 and 5752 and then divide by 37. I can do it, but it takes a long time. Is there any faster way to do those calculations?

What is 65 Times Ten Million? [3/29/1995]
What is 65 times ten million? Also, we've had pluses, multiples, and times. Are there going to be any new things after that?

What is 75% of $5000? [1/2/1995]
What is 75 percent of $5,000?

What is a Multiple? [12/4/1995]
What is the definition of a multiple?

What is multiplication? [11/09/1997]
What does multiplication have to do with addition, geometry, and real life?

Why Cancel? [02/25/2003]
Why do we have to cancel numbers?

Why Casting Out Nines Works [10/13/2008]
Can you explain in simple terms why the Casting Out Nines method works?

Why Does OF Mean Multiply? [12/04/2001]
I wanted to know why the word "of" means multiplication.

Why Is Mental Math Important? [03/25/2004]
How can I convince a 14 year old girl who is in 8th grade the importance of mental math? I think that skills like mentally adding and subtracting 2 digit numbers and being able to estimate multiplying 2 digit large numbers are critical. My daughter's teacher says that such skills aren't needed because of calculators and computers.

Why Multiplying by 10 Just Adds a Zero at the End [10/18/2005]
My 8-year old is having trouble understanding why multiplying by 10 just adds a 0 to the end of the number. Do you have any thoughts on how to explain it to her?

Why Rules? [08/15/2001]
Why do we need to have rules for order of operations?

The Zero Power of Two [12/10/1998]
Why is 2 to the 0 power equal to 1? I don't understand how a number can be multiplied by itself zero times.

Page: [<prev]  1  2  3  4  5

Search the Dr. Math Library:

Search: entire archive just Elementary Multiplication

Find items containing (put spaces between keywords):
Click only once for faster results:

[ Choose "whole words" when searching for a word like age.]

all keywords, in any order at least one, that exact phrase
parts of words whole words

[Privacy Policy] [Terms of Use]

Home || The Math Library || Quick Reference || Search || Help 

© 1994-2015 Drexel University. All rights reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.The Math Forum is a research and educational enterprise of the Drexel University School of Education.