These numbers: 1, 2, 4, 8, 16, 32.
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15 can go into 32 2 full times because 32/15=2.13333333
The HCF of 32 and 56 is 8
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32 has 6 factors, namely: 1, 2, 4, 8, 16, 32
4 is a common factor of 12, 32 and 72. Here is the proof: 12/4=3, 32/4=8, 72/4=18