I would guess either that is a trick question or the answer is 1.
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The greatest common factor (GCF) of 45 and 56 is 1. To find the GCF, you can list the factors of each number and then identify the largest number that divides both 45 and 56 without leaving a remainder. In this case, the only common factor of 45 and 56 is 1, making it the greatest common factor.
The greatest common factor of 12 and 56 is 4.
The greatest common factor of 24 and 56 is 8.The least common multiple of 24 and 56 is 168.