The factors of 10 are: 1, 2, 5, 10.
The factors of 20 are: 1, 2, 4, 5, 10, 20.
The factors of 30 are: 1, 2, 3, 5, 6, 10, 15, 30.
The common factors are: 1, 2, 5, 10.
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1, 2, 5, 10
They are: 1, 2, 5 and 10
The factors of 12 are 1, 2, 3, 4, 6, and 12. The factors of 20 are 1, 2, 4, 5, 10, and 20. The factors of 30 are 1, 2, 3, 5, 6, 10, 15, and 30. The greatest factor they all have in common is 2.
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.
The common factors of 10 and 30 are: 1, 2, 5, and 10 Btw, this exact answer was the first response to a google search of "common factors".