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Mental Addition Worksheet

Speed calculation lesson 5: Running totals · Set 573 · 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. 1.26 + 18 + 28 + 20 =
  2. 2.40 + 23 + 38 + 34 =
  3. 3.53 + 11 + 55 + 66 =
  4. 4.54 + 15 + 45 + 66 =
  5. 5.37 + 20 + 59 + 32 =
  6. 6.63 + 83 + 86 + 46 =
  7. 7.16 + 28 + 35 + 38 =
  8. 8.19 + 43 + 67 + 60 =
  9. 9.16 + 29 + 51 + 31 =
  10. 10.83 + 19 + 41 + 36 =
  11. 11.45 + 56 + 79 + 82 =
  12. 12.86 + 80 + 77 + 31 =
  13. 13.23 + 34 + 79 + 24 =
  14. 14.63 + 53 + 71 + 65 =
  15. 15.76 + 84 + 38 + 36 =
  16. 16.74 + 31 + 43 + 16 =
  17. 17.45 + 22 + 83 + 48 =
  18. 18.45 + 66 + 83 + 12 =
  19. 19.12 + 85 + 24 + 86 =
  20. 20.15 + 46 + 12 + 85 =
  21. 21.27 + 72 + 59 + 82 =
  22. 22.45 + 31 + 49 + 37 =
  23. 23.47 + 50 + 71 + 30 =
  24. 24.75 + 53 + 52 + 13 =
  25. 25.71 + 89 + 36 + 79 =
  26. 26.71 + 32 + 29 + 33 =
  27. 27.72 + 43 + 28 + 38 =
  28. 28.85 + 13 + 37 + 31 =
  29. 29.41 + 39 + 38 + 72 =
  30. 30.89 + 40 + 32 + 83 =
  31. 31.85 + 53 + 35 + 16 =
  32. 32.46 + 31 + 33 + 12 =
  33. 33.24 + 79 + 56 + 83 =
  34. 34.73 + 53 + 27 + 24 =
  35. 35.46 + 41 + 80 + 18 =
  36. 36.60 + 80 + 53 + 82 =
  37. 37.19 + 78 + 11 + 15 =
  38. 38.33 + 75 + 58 + 33 =
  39. 39.66 + 38 + 73 + 64 =
  40. 40.66 + 64 + 33 + 83 =

Answer key

  1. 92
  2. 135
  3. 185
  4. 180
  5. 148
  6. 278
  7. 117
  8. 189
  9. 127
  10. 179
  11. 262
  12. 274
  13. 160
  14. 252
  15. 234
  16. 164
  17. 198
  18. 206
  19. 207
  20. 158
  21. 240
  22. 162
  23. 198
  24. 193
  25. 275
  26. 165
  27. 181
  28. 166
  29. 190
  30. 244
  31. 189
  32. 122
  33. 242
  34. 177
  35. 185
  36. 275
  37. 123
  38. 199
  39. 241
  40. 246

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