Subtracting Mixed Numbers

Question 1:

5 2 3 - 1 5 9
37 9 = 4 1 9

Question 2:

5 1 3 - 4 1 10
37 30 = 1 7 30

Question 3:

5 6 7 - 2 1 2
47 14 = 3 5 14

Question 4:

5 1 3 - 3 5 6
9 6 = 1 3 6 = 1 1 2