The factors of 59 are:
1, 59
The factors of 81 are:
1, 3, 9, 27, 81
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GCF(145, 60) = 5.
The GCF of these numbers is 40.
50
The GCF is 55.
21 and 42 have a GCF of 21. 40 and 80 have a GCF of 40. The GCF of 21 and 40 is 1.