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Factors refer to integers, not decimals.
4 is the greatest common factor: it goes into 20 5 times and 24 6 times.
The GCF of 24, 40, and 56 is 8The GCF is 8.
The factors of 15 are 1, 3, 5, and 15. The factors of 24 are 1, 2, 3, 4, 6, 8, 12, and 24. The factors they have in common are 1 and 3. Therefore, the greatest common factor is 3. The greatest common factor can also be determined from the prime factors. The prime factors of 15 are 3 and 5. The prime factors of 24 are 2, 2, 2, and 3. The prime factors they have in common are a single 3, so the greatest common factor is 3.
The GCF is 5.
The greatest common factor of 5 and 5 is 5.