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Mental Addition Worksheet

Speed calculation lesson 5: Running totals · Set 397 · 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. 1.63 + 48 + 18 + 21 =
  2. 2.33 + 42 + 33 + 38 =
  3. 3.13 + 41 + 65 + 86 =
  4. 4.49 + 21 + 25 + 45 =
  5. 5.65 + 12 + 29 + 35 =
  6. 6.33 + 61 + 11 + 33 =
  7. 7.11 + 72 + 57 + 45 =
  8. 8.70 + 26 + 85 + 32 =
  9. 9.88 + 82 + 19 + 42 =
  10. 10.34 + 55 + 11 + 65 =
  11. 11.13 + 60 + 57 + 65 =
  12. 12.28 + 23 + 77 + 13 =
  13. 13.52 + 75 + 39 + 58 =
  14. 14.78 + 83 + 85 + 19 =
  15. 15.11 + 13 + 77 + 49 =
  16. 16.69 + 24 + 50 + 55 =
  17. 17.76 + 38 + 25 + 30 =
  18. 18.89 + 62 + 73 + 21 =
  19. 19.65 + 86 + 44 + 19 =
  20. 20.25 + 48 + 49 + 84 =
  21. 21.62 + 14 + 62 + 74 =
  22. 22.51 + 57 + 77 + 33 =
  23. 23.77 + 85 + 77 + 33 =
  24. 24.29 + 77 + 30 + 13 =
  25. 25.18 + 30 + 22 + 43 =
  26. 26.41 + 30 + 32 + 80 =
  27. 27.59 + 77 + 16 + 14 =
  28. 28.64 + 77 + 53 + 21 =
  29. 29.81 + 21 + 84 + 50 =
  30. 30.15 + 87 + 11 + 65 =
  31. 31.22 + 81 + 23 + 15 =
  32. 32.74 + 41 + 40 + 30 =
  33. 33.36 + 52 + 27 + 45 =
  34. 34.44 + 75 + 78 + 70 =
  35. 35.26 + 32 + 79 + 59 =
  36. 36.82 + 81 + 13 + 24 =
  37. 37.15 + 39 + 48 + 26 =
  38. 38.14 + 12 + 20 + 68 =
  39. 39.62 + 43 + 27 + 33 =
  40. 40.65 + 89 + 48 + 70 =

Answer key

  1. 150
  2. 146
  3. 205
  4. 140
  5. 141
  6. 138
  7. 185
  8. 213
  9. 231
  10. 165
  11. 195
  12. 141
  13. 224
  14. 265
  15. 150
  16. 198
  17. 169
  18. 245
  19. 214
  20. 206
  21. 212
  22. 218
  23. 272
  24. 149
  25. 113
  26. 183
  27. 166
  28. 215
  29. 236
  30. 178
  31. 141
  32. 185
  33. 160
  34. 267
  35. 196
  36. 200
  37. 128
  38. 114
  39. 165
  40. 272

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