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Mental Addition Worksheet

Speed calculation lesson 5: Running totals · Set 489 · 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. 1.41 + 15 + 36 + 30 =
  2. 2.76 + 17 + 62 + 63 =
  3. 3.39 + 73 + 20 + 74 =
  4. 4.63 + 82 + 68 + 18 =
  5. 5.71 + 25 + 72 + 33 =
  6. 6.88 + 82 + 53 + 74 =
  7. 7.61 + 70 + 79 + 45 =
  8. 8.53 + 73 + 46 + 23 =
  9. 9.23 + 21 + 78 + 20 =
  10. 10.62 + 41 + 45 + 62 =
  11. 11.67 + 29 + 85 + 75 =
  12. 12.67 + 53 + 85 + 58 =
  13. 13.76 + 63 + 15 + 46 =
  14. 14.74 + 47 + 21 + 60 =
  15. 15.70 + 41 + 42 + 83 =
  16. 16.79 + 29 + 50 + 51 =
  17. 17.36 + 22 + 15 + 31 =
  18. 18.60 + 19 + 87 + 66 =
  19. 19.19 + 79 + 81 + 60 =
  20. 20.55 + 60 + 21 + 20 =
  21. 21.62 + 31 + 44 + 64 =
  22. 22.13 + 89 + 35 + 67 =
  23. 23.48 + 86 + 46 + 24 =
  24. 24.26 + 16 + 14 + 45 =
  25. 25.13 + 87 + 88 + 82 =
  26. 26.20 + 22 + 59 + 77 =
  27. 27.34 + 20 + 13 + 89 =
  28. 28.51 + 72 + 67 + 89 =
  29. 29.59 + 19 + 87 + 73 =
  30. 30.39 + 59 + 29 + 36 =
  31. 31.81 + 72 + 87 + 36 =
  32. 32.66 + 76 + 12 + 88 =
  33. 33.56 + 25 + 77 + 23 =
  34. 34.40 + 62 + 25 + 17 =
  35. 35.40 + 51 + 36 + 62 =
  36. 36.19 + 39 + 60 + 24 =
  37. 37.36 + 51 + 21 + 59 =
  38. 38.88 + 26 + 59 + 60 =
  39. 39.14 + 67 + 45 + 50 =
  40. 40.75 + 43 + 36 + 29 =

Answer key

  1. 122
  2. 218
  3. 206
  4. 231
  5. 201
  6. 297
  7. 255
  8. 195
  9. 142
  10. 210
  11. 256
  12. 263
  13. 200
  14. 202
  15. 236
  16. 209
  17. 104
  18. 232
  19. 239
  20. 156
  21. 201
  22. 204
  23. 204
  24. 101
  25. 270
  26. 178
  27. 156
  28. 279
  29. 238
  30. 163
  31. 276
  32. 242
  33. 181
  34. 144
  35. 189
  36. 142
  37. 167
  38. 233
  39. 176
  40. 183

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