The factors of 21 are:
1, 3, 7, 21
The factors of 36 are:
1, 2, 3, 4, 6, 9, 12, 18, 36
The factors of 60 are:
1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60
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what are the common factors for 60 24 36
1, 2, 3, 4 and 6 are factors of both 36 and 60.
The common factors of 36 and 60 are 1, 2, 3, 4, 6, and 12. The greatest common factor (GCF) is 12.
1 and 3.
36, 14 and 21 have no common factors other than 1. Therefore, the greatest common factor is 1.