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Anonymous
If you are meaning 12/63, 3 can go into both (a good trick is to add the digits separately 1+2=3 and 6+3=9, if the answer is a multiple of 3 then 3 goes into it)
So therefore 4/21 is 12/63 simplified.
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7/12
63/64 cannot be simplified further.
6/63 = 2/21 simplified
54/63 = 6/7 simplified
45/63 is 5/7 simplified