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Mental Addition Worksheet

Speed calculation lesson 5: Running totals · Set 497 · 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. 1.16 + 16 + 43 + 43 =
  2. 2.77 + 21 + 86 + 51 =
  3. 3.35 + 28 + 13 + 27 =
  4. 4.85 + 33 + 87 + 41 =
  5. 5.16 + 75 + 14 + 18 =
  6. 6.58 + 23 + 47 + 80 =
  7. 7.23 + 13 + 33 + 13 =
  8. 8.26 + 80 + 31 + 79 =
  9. 9.51 + 50 + 32 + 81 =
  10. 10.20 + 28 + 81 + 41 =
  11. 11.85 + 11 + 38 + 39 =
  12. 12.37 + 18 + 14 + 70 =
  13. 13.77 + 88 + 88 + 31 =
  14. 14.47 + 26 + 83 + 33 =
  15. 15.54 + 35 + 69 + 87 =
  16. 16.13 + 56 + 73 + 89 =
  17. 17.33 + 11 + 16 + 62 =
  18. 18.28 + 11 + 15 + 57 =
  19. 19.77 + 16 + 84 + 24 =
  20. 20.77 + 17 + 46 + 76 =
  21. 21.36 + 28 + 78 + 45 =
  22. 22.64 + 51 + 28 + 15 =
  23. 23.34 + 55 + 36 + 54 =
  24. 24.15 + 24 + 31 + 20 =
  25. 25.13 + 25 + 51 + 71 =
  26. 26.21 + 62 + 56 + 56 =
  27. 27.89 + 24 + 36 + 42 =
  28. 28.67 + 54 + 87 + 30 =
  29. 29.34 + 76 + 85 + 30 =
  30. 30.74 + 30 + 26 + 48 =
  31. 31.31 + 64 + 49 + 26 =
  32. 32.15 + 53 + 43 + 25 =
  33. 33.80 + 82 + 75 + 32 =
  34. 34.22 + 81 + 47 + 15 =
  35. 35.81 + 45 + 81 + 89 =
  36. 36.62 + 23 + 74 + 68 =
  37. 37.17 + 30 + 51 + 17 =
  38. 38.66 + 48 + 33 + 18 =
  39. 39.47 + 70 + 75 + 31 =
  40. 40.50 + 70 + 73 + 85 =

Answer key

  1. 118
  2. 235
  3. 103
  4. 246
  5. 123
  6. 208
  7. 82
  8. 216
  9. 214
  10. 170
  11. 173
  12. 139
  13. 284
  14. 189
  15. 245
  16. 231
  17. 122
  18. 111
  19. 201
  20. 216
  21. 187
  22. 158
  23. 179
  24. 90
  25. 160
  26. 195
  27. 191
  28. 238
  29. 225
  30. 178
  31. 170
  32. 136
  33. 269
  34. 165
  35. 296
  36. 227
  37. 115
  38. 165
  39. 223
  40. 278

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