Question

Which fraction is in reduced form?
4/21
42/54
18/27
2/10

Answer 1

4/21

Explanation:

4/21 can't be reduced anymore there is no number that goes into 4 and 21 and divides perfectly.

4/21 = 4/21

42/54 = 21/27 = 7/9

18/27 = 6/9 = 2/3

2/10 = 1/5