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 TOPICS This page:   multiplication    Search   Dr. Math See also the Dr. Math FAQ:   multiplication facts and   order of operations Internet Library:   multiplication T2T FAQ:   learning to multiply ELEMENTARY Arithmetic    addition    subtraction    multiplication    division    fractions/decimals Definitions Geometry    2-dimensional      circles      triangles/polygons    3D and higher      polyhedra Golden Ratio/ Fibonacci Sequence History/Biography Measurement    calendars/      dates/time    temperature    terms/units Number Sense/ About Numbers    infinity    large numbers    place value    prime numbers    square roots Projects Puzzles 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. Rapid Multiplication ... Diagonally? [02/24/2010] Doctor Vogler describes the "accumulator" method for finding products of two multi-digit terms, then works through an example. Rectangular Arrays to Teach Multiplication [11/10/1994] I teach fourth grade math. Are rectangular arrays the best way to teach multiplication? Russian Peasant Multiplication [08/19/1997] I have a project to do on "Russian" or "peasant" multiplication. 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: [

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