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5/21 is in its simplest form.
5/21 is already in lowest terms.
21 over 49 in lowest terms is 3/7
The lowest term of 172 over 84 is 43/21 (in fraction form) or 21/21 (as a mixed number).
10 over 42 in lowest terms = 5/21
It is: 7/1
2/7
3/4
24/7
7/10
7/9
2/3
It is: 21/162 = 7/54