The factors of 18 are:
1, 2, 3, 6, 9, 18
The factors of 48 are:
1, 2, 3, 4, 6, 8, 12, 16, 24, 48
The factors of 72 are:
1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72
The common factors are:
1, 2, 3, 6
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18
Factors of 72: 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, and 72. Factors of 54: 1, 2, 3, 6, 9, 18, 27, and 54. Common factors of 72 and 54 (numbers that are on both lists): 1, 2, 3, 6, 9, and 18.
1, 2, 3, 6, 9, 18, 27, 54 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72 1, 2, 3, 6, 9, 18, 27, 54, 81, 162
GCF is 18:54 = 18 x 372 = 18 x 490 = 18 x 5
18, 36, 54, 72, 90