Factors of 12 are 1, 2, 3, 4, 6, and 12 or if represented as prime factors 2 x 2 x 3.
Factors of 20 are 1, 2, 4, 5, 10, and 20 or if represented as prime factors 2 x 2 x 5.
Factors of 32 are 1, 2, 4, 8, 16, and 32 or if represented as prime factors 2 x 2 x 2 x 2 x 2. The greatest common factor of 12, 20, and 32 would be 4.
The least common multiple of 12, 20, and 32 would be 480.
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The factors of 20 are 1, 2, 4, 5, 10, and 20. The factors of 32 are 1, 2, 4, 8, 16, and 32.
5, 10, and 20 are factors of 20 that are not also factors of 12.
20
The 12 factors of 160 are 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, and 160.
The GCF of 12, 20, 24, and 32 is 4