Fractions - Please help!

7/8 - 3/4
4/5 - 1/2
2/3 - 1/5
3/4 - 2/5


5/8 + 3/4
1/2 + 3/5
5/6 + 1/4
2/3 + 3/4



1/2 x 2/3
3/4 x 2/5
3/5 x 1/2
3/7 x 2/3
2/3 x 5/6
1/3 x 3/5
2/3 x 7/10
3/8 x 2/5
4/9 x 3/8
4/5 x 7/16

Hi, These are not are hard if you follow the rules of fractions.
7/8 - 3/4 = 7/8 - 6/8 = 1/8
4/5 - 1/2 = 8/10 - 5/10 = 3/10
2/3 - 1/5 = 10/15 - 3/15 = 7/15
3/4 - 2/5 = 15/20 - 8/20 = 7/20

5/8 + 3/4 = 5/8 + 6/8 = 11/8 = 1 3/8
1/2 + 3/5 = 5/10 + 6/10 = 11/10 = 1 1/10
5/6 + 1/4 = 10/12 + 3/12 = 13/12 = 1 1/12
2/3 + 3/4 = 8/12 + 9/12 = 17/12 = 1 5/12

1/2 x 2/3 = 2/6 = 1/3
3/4 x 2/5 = 6/20 = 3/10
3/5 x 1/2 = 3/10
3/7 x 2/3 = 6/21 =2/7
2/3 x 5/6 = 10/18 = 5/9
1/3 x 3/5 =3/15 = 1/5
2/3 x 7/10 = 14/30 = 7/15
3/8 x 2/5 = 6/40 = 3/20
4/9 x 3/8 = 12/72 = 1/6
4/5 x 7/16 = 28/80 = 7/20