Question

1/3 + 1/4 = , 1/3 + 2/4 = , 9/10 - 7/20 = , 11/18 - 5/12 = , 4/21 + 1/14 =

Answer 1

1/3 + 1/4
4/12 + 3/12 = 7/12
1/3 + 2/4
4/12 + 6/12
10/12=5/6
9/10 -7/20
18/20-7/20
11/20
11/18 -5/12
22/36-15/36
7/36
4/21+1/14
8/42+ 3/42
11/42