The factors of 21 are:
1, 3, 7, 21
The factors of 66 are:
1, 2, 3, 6, 11, 22, 33, 66
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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.
The factors of 42 are 1,2,3,6,7,14,21,42. The factors of 66 are 1,2,3,6,11,22,33,66
The prime factors of 66 are: 2 3 11
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 factors of 54 are: 1, 2, 3, 6, 9, 18, 27, 54 The factors of 66 are: 1, 2, 3, 6, 11, 22, 33, 66