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2.2: Prime & Composite
Factors
Numbers multiplied to form a product are factors of that product
2 and 14 are factors of 24
Prime Numbers: A number with exactly two factors:
1 and itself
Example: 23 has only two factors; 1 and 23
Composite Numbers: A number with more than two factors:
Example: 24 has multiple factors:
Factors of 24: 1, 2, 3, 4, 6, 8, 12, 24
4 x 6 = 24
2 x 12 = 24
24 x 1 = 24
8 x 3 = 24
Factor Trees
6
4
2
3
2
24
2
8
3
2
4
1
3
24
12
2
2
6
2
1
24
1
2
3
Circle the unique factors: (6, 4) (2, 3) (8, 3) (12, 2) (24, 1)
Practice
Practice PDFs available for download:
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