1, 2, 4, 5, 10, 20
1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90
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The GCF is 10.
The GCF is 10.
Factors of 90 are 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, and 90 Factors of 180 are 1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90, and 180 The factors of 90 and 180 not common to both numbers are 4, 12, 20, 36, 60, and 180.
The only common factors of 38 and 90 are 1 and 2, so it is not possible for a common factor of 38 and 90 to be greater than 2, much less 20.
The GCF of 40, 45, and 90 is 5 The factors of 40 are 1, 2, 4, 5, 8, 10, 20, and 40 The factors of 45 are 1, 3, 5, 9, 15, and 45 The factors of 90 are 1, 2, 3, 5, 6, 10, 15, 18, 30, 45, and 90 So the greatest common factor is 5.