The fraction 19/21 cannot be reduced any more.
It cannot be reduced any further, therefore its stays as 19/21
13/21 can't be reduced.
21/40 cannot be reduced.
19/10 is reduced and the answer is 1 and 9/10
19/21 - 2/7 = 19/21 - 6/21 = 13/21
25/21 is already reduced to its lowest terms
736 and 21 are comprime so the fraction cannot be reduced.
18 over 38 reduced = 9/19
No.
No.
Yes, 21/3 = 7/1
21/19 = 12/19