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Mental Addition Worksheet

Speed calculation lesson 5: Running totals · Set 400 · 40 questions
TalentJR

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.

NameDateTime takenScore ___ / 40
  1. 1.34 + 11 + 32 + 58 =
  2. 2.82 + 33 + 25 + 85 =
  3. 3.19 + 77 + 15 + 15 =
  4. 4.56 + 34 + 45 + 58 =
  5. 5.23 + 24 + 15 + 29 =
  6. 6.32 + 81 + 45 + 41 =
  7. 7.50 + 72 + 41 + 49 =
  8. 8.43 + 27 + 23 + 64 =
  9. 9.29 + 43 + 31 + 12 =
  10. 10.68 + 21 + 83 + 82 =
  11. 11.67 + 47 + 69 + 39 =
  12. 12.40 + 85 + 30 + 68 =
  13. 13.63 + 26 + 15 + 74 =
  14. 14.36 + 89 + 86 + 78 =
  15. 15.65 + 49 + 34 + 64 =
  16. 16.23 + 17 + 13 + 61 =
  17. 17.57 + 75 + 63 + 31 =
  18. 18.49 + 72 + 13 + 50 =
  19. 19.14 + 76 + 51 + 76 =
  20. 20.79 + 80 + 71 + 21 =
  21. 21.51 + 13 + 61 + 34 =
  22. 22.22 + 56 + 14 + 86 =
  23. 23.48 + 23 + 84 + 55 =
  24. 24.45 + 21 + 50 + 53 =
  25. 25.16 + 62 + 17 + 50 =
  26. 26.73 + 58 + 59 + 45 =
  27. 27.54 + 26 + 69 + 45 =
  28. 28.23 + 24 + 86 + 27 =
  29. 29.70 + 34 + 62 + 74 =
  30. 30.12 + 60 + 86 + 56 =
  31. 31.57 + 49 + 23 + 79 =
  32. 32.82 + 60 + 26 + 25 =
  33. 33.16 + 38 + 80 + 42 =
  34. 34.52 + 62 + 19 + 80 =
  35. 35.24 + 57 + 60 + 69 =
  36. 36.33 + 46 + 34 + 53 =
  37. 37.21 + 27 + 27 + 48 =
  38. 38.77 + 32 + 62 + 34 =
  39. 39.72 + 40 + 18 + 89 =
  40. 40.33 + 23 + 79 + 64 =

Answer key

  1. 135
  2. 225
  3. 126
  4. 193
  5. 91
  6. 199
  7. 212
  8. 157
  9. 115
  10. 254
  11. 222
  12. 223
  13. 178
  14. 289
  15. 212
  16. 114
  17. 226
  18. 184
  19. 217
  20. 251
  21. 159
  22. 178
  23. 210
  24. 169
  25. 145
  26. 235
  27. 194
  28. 160
  29. 240
  30. 214
  31. 208
  32. 193
  33. 176
  34. 213
  35. 210
  36. 166
  37. 123
  38. 205
  39. 219
  40. 199

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