adding and subtracting
what is 2/4 + 1/4
waht is 7.5 + 7.5
15
what is 4/7 + 2/7
6/7
what is 4/7 - 2/7
2/7
what is 12/12 - 10/12
2
what is 8.4 + 8.4
16
what is 11/10 + 11/10
23/10
what is 3/8 - 2/8
1/8
what is 6/3 + 1/3
7/3
what is 5.5 + 5.5
11
what is 35/12 + 3/5
70 /12
what is 12/11 - 3/11
9/11
what is 10/5 - 5/5
5
what is 9.3 + 9.3
18
what is 3/2 + 3/2
6/2
what is 35/11 - 5/11
20/11