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Example: 30 and 42

List the factors.

1,2,3,5,6,10,15,30

1,2,3,6,7,14,21,42

Select the common factors.

1,2,3 and 6, the GCF.

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13y ago

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More answers

By comparing their prime factorizations.

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9y ago
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Q: How do you find the greatest common factor of 4 digit numbers?
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