Subtracting Mixed Numbers

Question 1:

3 2 3 - 1 1 5
37 15 = 2 7 15

Question 2:

5 1 2 - 2 3 7
43 14 = 3 1 14

Question 3:

3 5 9 - 2 2 3
8 9

Question 4:

5 1 3 - 5 2 9
1 9