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1, 2, and 4
1, 2, 4, 7, 8, 14, 16, 28, 56, 112.
One.
The HCF is 4
2
28 over 16 would be: 28/16 = 7/4
2 goes evenly into 4 and 28
7 10 16 28
The highest common factor of both number is 28
16 + 12 = 28
The number is 1.