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The factors of 15 are: 1, 3, 5, 15

The factors of 45 are: 1, 3, 5, 9, 15, 45

The common factors are: 1, 3, 5, 15

The Greatest Common Factor (GCF) is: 15

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13y ago
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14y ago

15=1x3x5

45=1x3x3x5

GCF=1x3x5=>15

You use all the prime factors that are in BOTH numbers.

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Q: What is the greatest common factor for 15 and 45?
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