Subtracting Mixed Numbers

Question 1:

3 2 7 - 1 5 8
93 56 = 1 37 56

Question 2:

2 2 9 - 1 3 10
83 90

Question 3:

5 7 10 - 4 1 2
12 10 = 1 2 10 = 1 1 5

Question 4:

4 1 3 - 2 1 9
20 9 = 2 2 9