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The greatest common factor, or GCF, is the largest positive integer that will divide evenly with no remainder into both the composite numbers.

Example: 30 and 42

Factor them.

2 x 3 x 5 = 30

2 x 3 x 7 = 42

Select the common factors.

2 x 3 = 6, the GCF

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10y ago
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Q: What is the GCF of two composite numbers?
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