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Common factors are those that can be divided into two different numbers. For 4 and 40, their common factors are: 1, 2, 4, -1, -2, -4. Of these, the largest number is 4 (and this is therefore the greatest common factor).

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12y ago

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Since 4 is a factor of 40, it is automatically the GCF.

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8y ago
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Q: What is the greatest common factor 4 and 40?
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