12 x 12 x 12 x 12 x 12
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20
factors for 30 15,1,30,2 factors for 12 6,2,1,12,4,3
5, 10, and 20 are factors of 20 that are not also factors of 12.
The GCF of 5 and 12 is 1. Factors of 5 are 1 and 5 Factors of 12 are 1, 2, 3, 4, 6, and 12 So the GCF is 1.
The factors of 10 are 1, 2, 5, and 10. The factors of 12 are 1, 2, 3, 4, 6, and 12.