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Mental Addition Worksheet

Speed calculation lesson 5: Running totals · Set 143 · 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. 1.44 + 14 + 76 + 21 =
  2. 2.52 + 35 + 19 + 73 =
  3. 3.63 + 47 + 41 + 59 =
  4. 4.80 + 25 + 70 + 13 =
  5. 5.55 + 63 + 42 + 74 =
  6. 6.21 + 13 + 19 + 23 =
  7. 7.30 + 33 + 78 + 21 =
  8. 8.45 + 44 + 82 + 69 =
  9. 9.68 + 71 + 22 + 21 =
  10. 10.23 + 39 + 22 + 49 =
  11. 11.56 + 46 + 29 + 50 =
  12. 12.42 + 12 + 24 + 17 =
  13. 13.78 + 21 + 88 + 83 =
  14. 14.81 + 62 + 28 + 15 =
  15. 15.69 + 53 + 19 + 54 =
  16. 16.82 + 18 + 34 + 16 =
  17. 17.38 + 21 + 23 + 59 =
  18. 18.59 + 32 + 61 + 26 =
  19. 19.68 + 23 + 27 + 25 =
  20. 20.59 + 45 + 48 + 20 =
  21. 21.41 + 48 + 49 + 35 =
  22. 22.67 + 21 + 35 + 70 =
  23. 23.41 + 71 + 64 + 56 =
  24. 24.62 + 86 + 47 + 32 =
  25. 25.77 + 13 + 17 + 24 =
  26. 26.66 + 65 + 74 + 62 =
  27. 27.43 + 26 + 85 + 75 =
  28. 28.82 + 45 + 60 + 61 =
  29. 29.28 + 56 + 62 + 13 =
  30. 30.78 + 67 + 69 + 48 =
  31. 31.75 + 74 + 29 + 63 =
  32. 32.55 + 89 + 50 + 25 =
  33. 33.88 + 35 + 31 + 79 =
  34. 34.87 + 24 + 25 + 16 =
  35. 35.58 + 45 + 71 + 29 =
  36. 36.39 + 66 + 76 + 45 =
  37. 37.89 + 45 + 78 + 71 =
  38. 38.43 + 63 + 73 + 82 =
  39. 39.64 + 65 + 41 + 32 =
  40. 40.78 + 29 + 44 + 52 =

Answer key

  1. 155
  2. 179
  3. 210
  4. 188
  5. 234
  6. 76
  7. 162
  8. 240
  9. 182
  10. 133
  11. 181
  12. 95
  13. 270
  14. 186
  15. 195
  16. 150
  17. 141
  18. 178
  19. 143
  20. 172
  21. 173
  22. 193
  23. 232
  24. 227
  25. 131
  26. 267
  27. 229
  28. 248
  29. 159
  30. 262
  31. 241
  32. 219
  33. 233
  34. 152
  35. 203
  36. 226
  37. 283
  38. 261
  39. 202
  40. 203

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