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
2dimensional
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.
 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.
 Russian Peasant Multiplication [11/01/1997]

What is Russian peasant multiplication?
 Square Numbers [07/27/1999]

Can you explain what a square number is?
Page: [<prev]
1
2
3
4
5
[next>]
