Subtracting Fractions

Question 1:

6 8 - 4 8
2 8 = 1 4

Question 2:

6 7 - 1 7
5 7

Question 3:

3 10 - 1 10
2 10 = 1 5

Question 4:

10 15 - 2 8
50 120 = 5 12

Question 5:

3 10 - 1 15
7 30

Question 6:

1 2 - 1 5
3 10