Everyday Math Skills Workbooks series - Simply Math - My ERC

Composite Numbers are numbers that have more than two factors.
For example:
• 6 = 1 x 6 and 2 x 3
• The factors of 6 are 1, 2, 3, and 6.
A composite number may be written as a product of prime numbers.
For example: 12 is a composite number because it has more than 2 factors.
• 12 = 1 x 12 and 2 x 6 and 3 x 4
You can break these factors down to prime numbers.
For example:
• 12 = 2 x 6 (6 = 2 x 3)
• 12 = 2 x 2 x 3 (all prime numbers)
The Basic Skills
You broke the composite number (12) down to the prime numbers (2x2x3). This
shows how a composite number may be written as a product of prime numbers.
Greatest Common Factor is a number that divides evenly into two
numbers and it is the largest of all the factors that divides evenly into two
numbers. To find the greatest common factor (G.C.F.), you have to list all the
factors of the two numbers.
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Simply Math Workbook