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Multiples
To find a multiple of a whole number. You have to
skip and count by that number .

Example   5,10,15,20,25,30...

The Greatest Common Factor (G.C.F.) of two numbers is the
largest number that is a divisor of both. It is sometimes called
the Greatest Common Divisor.  
More About GCF
Common Factor is a number that will divide into
both numbers evenly. Two is a common factor of 4
and 14.

What Is a Factor in Math? -- powered by eHow.com
More videos
Factors are numbers that are multiplied to get a
product.  In the multiplication sentence
3X7=21, the
factors of 21 are
3 and 7.
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