The GCF is 10.
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The factors of 20 are: 1, 2, 4, 5, 10, 20
The factors of 30 are: 1, 2, 3, 5, 6, 10, 15, 30
The common factors of 20 and 30 are: 1, 2, 5, 10
The factors of 21 are: 1, 3, 7, and 21
The factor of 30 are: 1, 2, 3, 5, 6, 10, 15, and 30
Only common factors are 1 and 3.
The factors of 20 are 1, 2, 4, 5, 10 and 20. The factors of 30 are 1, 2, 3, 5, 6, 10, 15 and 30. Therefore their common factors are 1, 2, 5 and 10.
Factors of 60 are: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, and 60.1 + 20 + 30 = 51
The factors of 20 are: 1, 2, 4, 5, 10, 20 The factors of 30 are: 1, 2, 3, 5, 6, 10, 15, 30 The factors of 80 are: 1, 2, 4, 5, 8, 10, 16, 20, 40, 80
1, 2 and 4
Factors of 20: 1, 2, 4, 5, 10, 20Factors of 30: 1, 2, 3, 5, 6, 10, 15, 30Factors of 80: 1, 2, 4, 5, 8, 10, 16, 20, 40, 80Common factors of 20, 30, and 80: 1, 2, 5, 10