The common factors of 21 and 66 are 1 and 3.
The factors of 21 are 1, 3, 7, and 21.
The factors of 66 are 1, 2, 3, 6, 11, 22, 33, and 66.
The common factors are 1 and 3.
The greatest common factor is 3.
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let's see ; 21 = 3 times 7 ; 66 = 2 times 3 times 11.
3 must be the greatest common factor.
The factors of 21 are: 1, 3, 7, 21 The factors of 66 are: 1, 2, 3, 6, 11, 22, 33, 66
Factors of 28 are 1, 2, 4, 7, 14, and 28. Factors of 66 are 1, 2, 3, 6, 11, 22, 33, and 66. The only common factors of 28 and 66 are 1 and 2.
The common factors of 21 and 51 are: 1 and 3
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.
The common factors of 30 and 21 are 1 and 3.