The greatest common divisor of 16 and 20 is______ The least common multiple is______ ．

The greatest common divisor of 16 and 20 is______ The least common multiple is______ ．

8 = 2 × 2 × 216 = 2 × 2 × 2 × 220 = 2 × 2 × 5, so the greatest common divisor of 8, 16 and 20 is 2 × 2 = 4, and the least common multiple is 2 × 2 × 2 × 2 × 5 = 80, so the answer is 4; 80

Least common factor of 72 and 28

The least common factor of 72 and 28 is 1

What are the common factors of 72 and 48?

The factors of 72 are: 1, 2, 3, 4, 6, 8, 9, 12, 16, 24, 36, 72
The factors of 48 are: 1, 2, 3, 4, 6, 8, 12, 16, 24, 48
The common factors of 72 and 48 are: 1, 2, 3, 4, 6, 8, 12, 16 and 24
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