Adding Mixed Numbers

Question 1:

2 6 7 + 5 1 3
172 21 = 8 4 21

Question 2:

1 1 5 + 2 9 10
41 10 = 4 1 10

Question 3:

5 5 8 + 2 3 4
67 8 = 8 3 8

Question 4:

5 2 5 + 4 4 9
443 45 = 9 38 45