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The greatest common factor (or highest common factor) is the highest number that divides exactly into two or more numbers.

20: 1, 2, 4, 5, 10, 20

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

The highest common factor of 20 and 30 is 10.

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Q: What is the highest common factor of 20 and 30?
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