The factors of 64 are 2, 2, 2, 2, 2, 2 (or 26.)
The factors of 88 are 2, 2, 2, 11 (or 23, 11.)
Therefore, the hcf would be 8 (23.)
If this was a fraction problem of:
64
--- to simplify you would divide the fraction by 8/8, leaving you with 8/11 as your answer.
88
Obviously, 8 and 11 have no common factors remaining once this has been done.
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The greatest common factor of 16 and 80 is 16.
The factors of 16 are 1,2,4,8,16.
The factors of 80 are 1,2,4,5,,8,10,16,20,40,80.
The greatest number in each list is 16.