5/21
87/21 - 73/21 = 14/21 = 2/3
19/21 - 4/12 (4/12 = 1/3) = 12/21Convert the 1/3 into 7/21 and subtract.
6/7 - 2/3 = 18/21 - 14/21 = 4/21
13/21 - 7/21 = 6/21 Sorry, DJ, 4 over 7 = 12/21 so answer is 5/21
2/3 - 4/7 = 14/21 - 12/21 = 2/21
5/21
87/21 - 73/21 = 14/21 = 2/3
6/7 - 2/3 = 18/21 - 14/21 = 4/21
6/7 - 2/3 = 18/21 - 14/21 = 4/21
19/21 - 4/12 (4/12 = 1/3) = 12/21Convert the 1/3 into 7/21 and subtract.
7 − 43/4 = 21/4
-6/4 − 3/4 = -21/4
6/7 - 2/3 = 18/21 - 14/21 = 4/21
23/3 = 161/21 22/7 = 66/21 161 - 66 = 95 95/21 = 4 and 11/21
13/21 - 7/21 = 6/21 Sorry, DJ, 4 over 7 = 12/21 so answer is 5/21
4/7 minus 3/4 is -5/28