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Mental Addition Worksheet

Speed calculation lesson 5: Running totals · Set 298 · 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. 1.30 + 53 + 21 + 41 =
  2. 2.17 + 32 + 14 + 71 =
  3. 3.25 + 81 + 51 + 62 =
  4. 4.85 + 35 + 46 + 21 =
  5. 5.71 + 45 + 87 + 46 =
  6. 6.20 + 20 + 77 + 16 =
  7. 7.25 + 21 + 52 + 26 =
  8. 8.69 + 19 + 33 + 87 =
  9. 9.40 + 79 + 84 + 82 =
  10. 10.87 + 28 + 58 + 53 =
  11. 11.12 + 37 + 48 + 46 =
  12. 12.39 + 75 + 45 + 52 =
  13. 13.30 + 32 + 22 + 50 =
  14. 14.33 + 65 + 89 + 29 =
  15. 15.36 + 17 + 77 + 29 =
  16. 16.85 + 17 + 84 + 73 =
  17. 17.21 + 23 + 39 + 75 =
  18. 18.33 + 37 + 77 + 86 =
  19. 19.64 + 37 + 35 + 15 =
  20. 20.33 + 60 + 68 + 22 =
  21. 21.63 + 28 + 59 + 87 =
  22. 22.59 + 18 + 61 + 54 =
  23. 23.83 + 82 + 57 + 66 =
  24. 24.27 + 72 + 74 + 85 =
  25. 25.55 + 85 + 25 + 57 =
  26. 26.78 + 75 + 56 + 68 =
  27. 27.59 + 74 + 43 + 30 =
  28. 28.33 + 69 + 88 + 52 =
  29. 29.76 + 80 + 82 + 43 =
  30. 30.81 + 13 + 27 + 45 =
  31. 31.60 + 37 + 63 + 41 =
  32. 32.26 + 62 + 76 + 77 =
  33. 33.51 + 12 + 18 + 42 =
  34. 34.83 + 62 + 48 + 26 =
  35. 35.82 + 41 + 60 + 17 =
  36. 36.46 + 15 + 88 + 82 =
  37. 37.24 + 12 + 22 + 52 =
  38. 38.24 + 65 + 50 + 72 =
  39. 39.81 + 43 + 85 + 88 =
  40. 40.80 + 66 + 56 + 26 =

Answer key

  1. 145
  2. 134
  3. 219
  4. 187
  5. 249
  6. 133
  7. 124
  8. 208
  9. 285
  10. 226
  11. 143
  12. 211
  13. 134
  14. 216
  15. 159
  16. 259
  17. 158
  18. 233
  19. 151
  20. 183
  21. 237
  22. 192
  23. 288
  24. 258
  25. 222
  26. 277
  27. 206
  28. 242
  29. 281
  30. 166
  31. 201
  32. 241
  33. 123
  34. 219
  35. 200
  36. 231
  37. 110
  38. 211
  39. 297
  40. 228

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