The factors of 21 are 1,3,7, and 21.
The factors of 70 are 1,2,5,7,14,35, and 70
The common factors of 21 and 70 are 1 and 7.
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The common factors of 21 and 51 are: 1 and 3
The factors of 21 are: 1, 3, 7, 21The factors of 70 are: 1, 2, 5, 7, 10, 14, 35, 70The common factors are: 1, 7
The common factors of 30 and 21 are 1 and 3.
The common factors of 21 and 24 are: 1 and 3
The common factors of 21 and 42 are 3, 7 and 21. The greatest common factor (GCF) is 21.