The factors of 18 are:
1, 2, 3, 6, 9, 18
The factors of 90 are:
1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90
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1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72
1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90
The factors of 70 are:
1, 2, 5, 7, 10, 14, 35, 70
The factors of 90 are:
1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90
1, 2, 3, 6, 9, 18
1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72
1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90
The factors of 18 are: 1, 2, 3, 6, 9, 18
The factors of 60 are: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60
The factors of 56 are: 1, 2, 4, 7, 8, 14, 28, 56The factors of 72 are: 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72The factors of 90 are: 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90
GCF is 18:54 = 18 x 372 = 18 x 490 = 18 x 5
18, 36, 54, 72, 90
Since 18 is a factor of 72, all of its factors are common.
Factors of 36 are 1, 2, 3, 4, 6, 9, 12, 18, and 36. The factors of 72 are 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, and 72. All of the factors of 36 are also factors of 72.