5 and 16.■
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Factors of 21: 1, 3, 7, 21 Factors of 2: 1, 2 GCF (21, 2) =
The factors of 21 are 1, 3, 7, and 21. 3 - 1 = 2
The factors for 80 are: 10, 8, 40, 2, 20, 4, 1, 80, 16 and 5.
40 x 2 = 80
factors of the numbers 18 - 1, 2, 3, 6, 9, 18 64 - 1, 2, 4, 8, 16, 32, 64 27 - 1, 3, 9, 27 66 - 1, 2, 3, 6, 11, 22, 33, 66 40 - 1, 2, 4, 5, 8, 10, 20, 40 72 - 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72 80 - 1, 2, 4, 5, 8, 10, 16, 20, 40, 80 21 - 1, 3, 7, 21 prime factors of the numbers 18 - 2, 2, 3 64 - 2, 2, 2, 2, 2, 2 27 - 3, 3, 3 66 - 2, 3, 11 40 - 2, 2, 2, 5 72 - 2, 2, 2, 3, 3 80 - 2, 2, 2, 2, 5 21 - 3, 7