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Mental Addition Worksheet

Speed calculation lesson 5: Running totals · Set 123 · 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. 1.56 + 49 + 35 + 21 =
  2. 2.73 + 42 + 12 + 83 =
  3. 3.57 + 59 + 52 + 13 =
  4. 4.13 + 39 + 57 + 28 =
  5. 5.50 + 70 + 82 + 22 =
  6. 6.46 + 56 + 73 + 46 =
  7. 7.65 + 26 + 24 + 58 =
  8. 8.16 + 31 + 83 + 14 =
  9. 9.88 + 36 + 41 + 65 =
  10. 10.18 + 76 + 63 + 45 =
  11. 11.62 + 38 + 86 + 25 =
  12. 12.67 + 84 + 73 + 52 =
  13. 13.88 + 47 + 80 + 66 =
  14. 14.45 + 15 + 70 + 40 =
  15. 15.44 + 23 + 68 + 50 =
  16. 16.28 + 63 + 22 + 11 =
  17. 17.29 + 89 + 72 + 87 =
  18. 18.51 + 43 + 62 + 71 =
  19. 19.31 + 65 + 28 + 84 =
  20. 20.80 + 33 + 44 + 87 =
  21. 21.38 + 89 + 14 + 38 =
  22. 22.12 + 76 + 87 + 83 =
  23. 23.83 + 45 + 65 + 11 =
  24. 24.17 + 38 + 49 + 76 =
  25. 25.85 + 83 + 78 + 31 =
  26. 26.49 + 30 + 17 + 59 =
  27. 27.26 + 44 + 26 + 84 =
  28. 28.53 + 38 + 89 + 58 =
  29. 29.17 + 64 + 47 + 44 =
  30. 30.65 + 74 + 36 + 40 =
  31. 31.18 + 63 + 51 + 72 =
  32. 32.70 + 47 + 15 + 73 =
  33. 33.14 + 63 + 34 + 38 =
  34. 34.87 + 23 + 32 + 89 =
  35. 35.53 + 22 + 38 + 51 =
  36. 36.22 + 73 + 37 + 44 =
  37. 37.85 + 82 + 82 + 47 =
  38. 38.13 + 31 + 80 + 41 =
  39. 39.48 + 33 + 59 + 25 =
  40. 40.52 + 69 + 23 + 58 =

Answer key

  1. 161
  2. 210
  3. 181
  4. 137
  5. 224
  6. 221
  7. 173
  8. 144
  9. 230
  10. 202
  11. 211
  12. 276
  13. 281
  14. 170
  15. 185
  16. 124
  17. 277
  18. 227
  19. 208
  20. 244
  21. 179
  22. 258
  23. 204
  24. 180
  25. 277
  26. 155
  27. 180
  28. 238
  29. 172
  30. 215
  31. 204
  32. 205
  33. 149
  34. 231
  35. 164
  36. 176
  37. 296
  38. 165
  39. 165
  40. 202

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