201.5238
21 5/x (Write as this, but fill in what you divided with where X is.)
21 divided by 7 is three.
3 over 7 x 21 over 1 and 21 over 1 x 3 over 7
3/4 divided by 21 is 0.0357142857143
20/21
0.3134
0.0043
0.0206
0.0042
0.0085
Three is the lowest common denominator. 21 divided by 3 = 7 54 divided by 3 = 18 21/54 = 7/18