3/21 can be reduced to 1/7.
21/35 = 3/5
3/8
Both 21 and 9 can be divided by 3. 21/3=7 9/3=3 So 21 over 9 can be simplified to 7 over 3.
3/7
Yes. 1/3 because 7 x 3 = 21
14/21 reduces to 2/3
13/21 can't be reduced.
Yes as both are divisible by 3.. 21 over 22
21/40 cannot be reduced.
25/21 is already reduced to its lowest terms
736 and 21 are comprime so the fraction cannot be reduced.
The fraction 19/21 cannot be reduced any more.