There is no such thing as the smallest common factor. I guess the smallest common factor (integers only) for 16 and 24 would be -8. But that's just the negative version of the greatest common factor. I think you meant to ask either what is the smallest common multiple of 16 and 24 or what is the greatest common factor of 16 and 24. The greatest common factor of 16 and 24 is 8. The smallest common multiple of 16 and 24 is 48.
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The greatest common factor of 8, 16, and 24 is 8
The GCF of 16 and 24 is 8.
The factors of 16 are 1, 2, 4, 8, and 16. The factors of 64 are 1, 2, 4, 8, 16, 32, and 64. The common factors are 1, 2, 4, 8, and 16. The least (smallest) common factor is 1. The smallest common prime factor is 2.
The GCF is 8.
The GCF is 8.