20/28 + 21/28 = 41/28 or 1 and 13/28
5/7 + 3/4 = 113/28
4/5 is greater than 3/7
4/5 of 7 is 5 3/5
The LCD for 4/7 and 3/5 is 35.
4/5 + 3/5 = 7/5
4/7 minus 3/4 is -5/28
-3/5 - 4/5 is the same as saying.... -3/5 + -4/5 = -7/5
-3/5 x 4/7 is -12/35
It is 5 3/7.
5 over 7 times 5 = 25/7 = 3 4/7
7/3 +5/3=12/3=4
4/5 - 1/3 = 7/15