87/10000 cannot be simplified.
87/18 = 29/6 when simplified
54/63 = 6/7 simplified
87/54 = 29/18
4914/54 = 4914 ÷ 54 = 91
42/54 = 7/9
315/54= 105/16
33/54 = 11/18
20/29
54/121 is already in its simplest form
Yes. 21 over 54 can be simplfied to 7/18
27/70