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Factors of 30 are: 1, 2, 3, 5, 6, 10, 15, and 30.

Factors of 40 are: 1, 2, 4, 5, 8, 10, 20, and 40. Find the greatest factor they both have in common. That is the greatest common factor.

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Q: What are the highest common factors in the numbers 30 and 40?
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