Mental Addition Worksheet

Speed calculation lesson 5: Running totals · Set 650 · 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. 1.69 + 48 + 46 + 36 =
2. 2.55 + 39 + 29 + 14 =
3. 3.59 + 22 + 58 + 86 =
4. 4.30 + 57 + 79 + 80 =
5. 5.62 + 24 + 59 + 60 =
6. 6.64 + 27 + 65 + 18 =
7. 7.83 + 60 + 17 + 83 =
8. 8.82 + 54 + 11 + 38 =
9. 9.34 + 80 + 49 + 49 =
10. 10.48 + 61 + 49 + 39 =
11. 11.33 + 18 + 52 + 50 =
12. 12.70 + 13 + 47 + 50 =
13. 13.75 + 35 + 80 + 22 =
14. 14.52 + 49 + 21 + 83 =
15. 15.62 + 24 + 60 + 60 =
16. 16.72 + 89 + 42 + 30 =
17. 17.37 + 82 + 41 + 64 =
18. 18.35 + 29 + 84 + 23 =
19. 19.45 + 23 + 34 + 21 =
20. 20.57 + 33 + 77 + 44 =
21. 21.20 + 81 + 47 + 39 =
22. 22.78 + 76 + 68 + 64 =
23. 23.43 + 33 + 74 + 19 =
24. 24.45 + 67 + 72 + 11 =
25. 25.11 + 15 + 80 + 11 =
26. 26.45 + 37 + 34 + 37 =
27. 27.29 + 60 + 40 + 21 =
28. 28.25 + 80 + 87 + 61 =
29. 29.68 + 12 + 69 + 85 =
30. 30.41 + 87 + 23 + 86 =
31. 31.13 + 58 + 26 + 85 =
32. 32.77 + 86 + 28 + 65 =
33. 33.49 + 26 + 31 + 63 =
34. 34.61 + 35 + 13 + 49 =
35. 35.30 + 42 + 17 + 13 =
36. 36.33 + 78 + 39 + 87 =
37. 37.21 + 43 + 25 + 24 =
38. 38.54 + 43 + 74 + 17 =
39. 39.66 + 77 + 60 + 33 =
40. 40.64 + 83 + 52 + 76 =

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