Common factors of 72 and 112 are: 1, 2, 4, and 8.
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The greatest common factor is 9
Factor each one and use each prime factor the most it was used in any of the numbers. 9=3x3 12=2x2x3 81=3x3x3x3 2x2x3x3x3x3=324
The greatest common factor of 56 and 81 is 1.
The highest common factor of 36 and 72 is 36
The GCF of 53 and 81 is 1.