Factors are those numbers which can be evenly divided into a number.
The factors of 21 would be 1, 3, 7, 21
The factors of 28 would be 1, 2, 4, 7, 14, 28
The factors of 15 would be 1, 3, 5, 15
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The factors of 15 are: 1, 3, 5, and 15.The prime factors of 15 are: 3 and 5.The factors of 21 are: 1, 3, 7, and 21.The prime factors of 21 are: 3 and 7.
The factors of 15 are: 1, 3, 5, 15 The factors of 21 are: 1, 3, 7, 21 The factors of 33 are: 1, 3, 11, 33
The factors of 21 are: 1, 3, 7, 21 The factors of 23 are: 1, 23
The factors of 28 are: 1, 2, 4, 7, 14, 28 The factors of 42 are: 1, 2, 3, 6, 7, 14, 21, 42 The factors of 63 are: 1, 3, 7, 9, 21, 63
14 and 21, and 21 and 28 are the number pairs between 15 and 30 that have 7 as their greatest common factor.