Roots of Reason
rootsofreason.org
Two 2-Digit Numbers, No Paper · Grade 4
Mental Addition Drill
Name
Date
Time
Score / 20
Find the sums in your head - tens first, then ones. No column work.
1. 28 + 10 =
2. 22 + 44 =
3. 51 + 19 =
4. 70 + 18 =
5. 60 + 12 =
6. 29 + 66 =
7. 21 + 66 =
8. 30 + 18 =
9. 45 + 34 =
10. 89 + 11 =
11. 18 + 72 =
12. 28 + 67 =
13. 31 + 55 =
14. 13 + 45 =
15. 32 + 31 =
16. 13 + 49 =
17. 68 + 24 =
18. 26 + 28 =
19. 43 + 10 =
20. 22 + 55 =
Roots of Reason
rootsofreason.org
Two 2-Digit Numbers, No Paper · Grade 4
Mental Addition Drill
1. 28 + 10 = 38
2. 22 + 44 = 66
3. 51 + 19 = 70
4. 70 + 18 = 88
5. 60 + 12 = 72
6. 29 + 66 = 95
7. 21 + 66 = 87
8. 30 + 18 = 48
9. 45 + 34 = 79
10. 89 + 11 = 100
11. 18 + 72 = 90
12. 28 + 67 = 95
13. 31 + 55 = 86
14. 13 + 45 = 58
15. 32 + 31 = 63
16. 13 + 49 = 62
17. 68 + 24 = 92
18. 26 + 28 = 54
19. 43 + 10 = 53
20. 22 + 55 = 77