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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.
7/12
54/63 = 6/7 simplified
63/64 cannot be simplified further.
6/63 = 2/21 simplified
45/63 is 5/7 simplified
12 over 63 simplified = 4/21
It is: 63/60 = 21/20 simplified
63% = 63/100
63/100
2/63
41/63
The simplified fraction of 15 over 63 is 5/21