Find the missing number: addition and subtraction to 100

Write the number that goes in the box.

1. □ + 8 = 10 What number goes in the box?
2. 12 − □ = 10 What number goes in the box?
3. 7 + □ = 9 What number goes in the box?
4. □ + 9 = 11 What number goes in the box?
5. 22 − □ = 18 What number goes in the box?
6. □ − 1 = 10 What number goes in the box?
7. 3 + □ = 6 What number goes in the box?
8. □ − 17 = 8 What number goes in the box?
9. □ − 3 = 45 What number goes in the box?
10. 16 − □ = 7 What number goes in the box?
11. 22 + □ = 30 What number goes in the box?
12. □ − 8 = 6 What number goes in the box?
13. 25 + □ = 48 What number goes in the box?
14. □ − 16 = 57 What number goes in the box?
15. 75 − □ = 35 What number goes in the box?
16. □ + 51 = 72 What number goes in the box?
17. 56 − □ = 38 What number goes in the box?
18. 77 − □ = 51 What number goes in the box?
19. 91 − □ = 76 What number goes in the box?
20. 58 + □ = 60 What number goes in the box?