Subtracting Mixed Numbers

Question 1:

4 2 5 - 3 3 4
13 20

Question 2:

5 1 3 - 5 1 4
1 12

Question 3:

4 4 7 - 4 1 4
9 28

Question 4:

5 1 2 - 3 4 5
17 10 = 1 7 10