Adding Fractions

Question 1:

1 3 + 2 3
3 3 = 1

Question 2:

2 4 + 1 4
3 4

Question 3:

7 9 + 2 9
9 9 = 1

Question 4:

1 5 + 1 2
7 10

Question 5:

1 6 + 3 4
11 12

Question 6:

1 6 + 2 8
10 24 = 5 12