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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.
 Multiplying by 1 [09/01/1998]

Why doesn't a number change when you multiply it by 1?
 Multiplying by 1000 [03/10/1997]

What is 2,542 times 1,000?
 Multiplying by 11 [09/16/1997]

We said: 568 x 11 and after about 5 seconds she said the answer was 6248.
How did she do it so quickly?
 Multiplying by a Decimal [11/10/1994]

How come when you multipy 0.36 and 88 you get 9.4270, which is less than
what it should be?
 Multiplying by Nine [01/10/1997]

Why is the sum of the two digits 9 when you multiply 9 times any number
between 1 and 10?
 Multiplying by Zero [03/01/2002]

Why does any number times zero equal zero?
 Multiplying Decimal Numbers and Placing the Decimal Point [09/20/2007]

Why does counting up the total decimal places when multiplying decimal
numbers work?
 Multiplying Decimals and Decreasing Answers [12/02/1998]

Why does multiplying by a decimal decrease the answer? How can you have
less than what you started with when you multiply?
 Multiplying Fractions [01/20/1997]

If multiplication is defined as repeated addition, why is the product of
two fractions smaller than either of the fractions?
 Multiplying Huge Numbers [5/9/1996]

8541 * 4372 = 37340252  How can I check my answer?
 Multiplying Mixed Numbers [06/02/2003]

Can you multiply mixed numbers without changing them into improper
fractions?
 Multiplying Mixed Numbers [04/06/2004]

Why do you need to convert mixed numbers to improper fractions before
multiplying them together? What is the mathematical reason behind
this operation?
 Multiplying Negative Integers [11/07/2001]

Multiplying negative integers by breaking each negative number into a
positive number multiplied by 1.
 Multiplying Negatives [1/13/1995]

An adult ponders his elementary school lessons of multiplication and
negative numbers. We can rewrite 2*3 as 2 + 2 + 2, but how can we re
write 2 * 3?
 Multiplying Sets [11/28/1994]

If you are multiplying three sets of 8 do you write the problem 3x8 or
8x8?
 Multiplying Small Numbers [6/15/1996]

I don't know what 6 times 6 is.
 Multiplying TwoDigit Numbers [06/04/1998]

Can you show me how to multiply twodigit numbers like 39 x 98?
 Napier's Bones [01/20/1997]

How do you use Napier's Bones to do multiplication?
 Napier's Rods [03/05/1999]

How do Napier's bones work?
 Negative Two Kids [09/27/2002]

Let's say 3 x 2 = 6. Three is how many kids there are in a 'group.'
Two is how many 'groups' there are, and six is the answer. Now let's
say 3 x (2) = 6. How can you have negative two 'groups' of three
kids?
 Number of Places in Products of Decimals [09/19/2002]

When you multiply decimals, why is there always the same number of
decimal places in the answer as in the problem?
 Number Properties [01/26/1998]

What are the definitions for addition and multiplication of: closure,
commutative, associative, and identity?
 Number Puzzle Based on Multiplication Ideas [08/07/2005]

Find the smallest possible natural number that ends in 6 such that if
the 6 is erased and placed in front of the remaining digits, the
resulting number is 4 times as large as the original number.
 Numbers Bigger Than 12 [03/22/1997]

How do you do problems like 14 x 7?
 One Billion as Product of Two Numbers with No Zeros [12/12/2001]

Write 1,000,000,000 as the product of two numbers, neither of which
contains any zeros.
 Ordering the Operations [11/10/1998]

Why does the order of operations have to be in that order? Who set that
specific order of operations?
 Order of Digits in Multiplication [03/27/2001]

Why do we learn to multiply starting with the least significant digits in
the ones place, instead of starting with the larger place values?
 Order of Operations [01/25/1998]

Evaluate the expression: 30  5^2 + 4^3.
 Order of Operations [8/21/1996]

How do I solve (8.2  3.6)(3 * 3.6 + 6)?
 Order of Operations and Fractions [02/22/2002]

Given a+3 and b+5, is 105 / ab 7 or 175?
 Order of Operations: Parentheses as Packages [10/25/2001]

I need help figuring out the steps in this expression: 5{4[2^411(9
1)]}=
 Order of Operations vs. Associative Property [10/10/2002]

Is the associative property an exception to the order of operations, a
corollary, or something totally unrelated?
 Order of Operations vs. Distributive Property [02/04/2005]

Does the distributive property contradict the rules of order of
operations? When we have a(b + c) order of operations says we should
add first in the parentheses, then multiply, but the distributive
property says we can multiply first to get ab + ac, then add.
 Paperless Multiplication [07/23/2002]

How can I do twodigit multiplications (e.g., 99*98) without having to
use paper?
 Parts of a Subtraction Problem [04/09/2001]

What are the numbers 4 and 1 called in the subtraction 4  1 = 3?
 Properties, Defined and Illustrated [10/10/2001]

I need a page of information on the commutative, associative, and
F.O.I.L. properties.
 Proving That (1) * (1) = 1 [01/30/2006]

At the high school level it is difficult to prove that 1 x 1 = 1. Is
there a published proof somewhere that is appropriate for kids that age?
 Rapid Multiplication ... Diagonally? [02/24/2010]

Doctor Vogler describes the "accumulator" method for finding products
of two multidigit 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.
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