The factors of 8 are 1, 2, 4, and 8.
The factors of 16 are 1, 2, 4, 8, and 16.
The common factors of 8 and 16 are 1, 2, 4, and 8. The least (smallest) common factor is 1.
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The factors of 16 are 1, 2, 4, 8, and 16. The factors of 21 are 1, 3, 7, and 21. The only common factor is 1; they are relatively prime. The least (or lowest) common factor is 1. The greatest (or highest) common factor is 1.
The factors of 12 are 1, 2, 3, 4, 6, and 12. The factors of 16 are 1, 2, 4, 8, and 16. The common factors of 12 and 16 are 1, 2, and 4. Therefore, the least common factor (the smallest common factor) is 1.
The least common factor of 5 and 8 is 1. The least common factor of any set of integers is 1.
The greatest common factor of the numbers 8, 16 and 32 is 8.The GCF is 8.
The least common multiple of 4, 8, and 16 is 16.