Mental Addition Worksheet

Speed calculation lesson 5: Running totals · Set 165 · 40 questions

The fast method (Keep a running total): Start with the first number. Add the tens of the next number, then its ones. Keep going until the list ends — only one total in your head at a time.

1. 1.39 + 81 + 77 + 71 =
2. 2.44 + 65 + 58 + 77 =
3. 3.44 + 29 + 43 + 83 =
4. 4.47 + 21 + 79 + 67 =
5. 5.80 + 43 + 34 + 45 =
6. 6.38 + 45 + 27 + 46 =
7. 7.12 + 76 + 64 + 33 =
8. 8.35 + 28 + 62 + 53 =
9. 9.38 + 81 + 53 + 82 =
10. 10.53 + 31 + 12 + 72 =
11. 11.25 + 62 + 88 + 20 =
12. 12.44 + 83 + 65 + 56 =
13. 13.70 + 16 + 27 + 73 =
14. 14.70 + 31 + 15 + 31 =
15. 15.83 + 40 + 82 + 15 =
16. 16.45 + 14 + 60 + 35 =
17. 17.24 + 54 + 25 + 80 =
18. 18.72 + 21 + 65 + 64 =
19. 19.76 + 55 + 13 + 34 =
20. 20.38 + 59 + 78 + 60 =
21. 21.69 + 13 + 45 + 61 =
22. 22.81 + 44 + 60 + 31 =
23. 23.46 + 85 + 79 + 13 =
24. 24.58 + 59 + 89 + 74 =
25. 25.86 + 44 + 20 + 17 =
26. 26.16 + 24 + 61 + 15 =
27. 27.81 + 59 + 27 + 29 =
28. 28.55 + 68 + 21 + 22 =
29. 29.23 + 31 + 36 + 77 =
30. 30.15 + 17 + 82 + 36 =
31. 31.72 + 14 + 35 + 28 =
32. 32.85 + 57 + 27 + 77 =
33. 33.52 + 14 + 52 + 63 =
34. 34.77 + 38 + 87 + 62 =
35. 35.14 + 16 + 87 + 81 =
36. 36.74 + 38 + 46 + 20 =
37. 37.64 + 51 + 25 + 80 =
38. 38.87 + 69 + 33 + 27 =
39. 39.32 + 12 + 17 + 39 =
40. 40.76 + 84 + 47 + 52 =

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