The factors of 21 are 1, 3, 7 and 21.
The factors of 18 are 1, 2, 3, 6, 14 and 18.
Therefore the common factors are 1 and 3.
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The factors of 18 are 1, 2, 3, 6, 9, and 18. The factors of 21 are 1, 3, 7, and 21. The common factors are 1 and 3. Therefore, the least common factor (the smallest common factor) is 1. Factorizations: 18-3x3x2 21-7x3
The common factors of 18 and 42 are 1, 2, 3, and 6. The factors of 18 are 1, 2, 3, 6, 9, and 18. The factors of 42 are 1, 2, 3, 6, 7, 14, 21, and 42. The common factors of 18 and 42 are 1, 2, 3, and 6.
The factors of 18 are: 1, 2, 3, 6, 9, 18The factors of 63 are: 1, 3, 7, 9, 21, 63The common factors are: 1, 3, 9
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.