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Mental Addition Worksheet

Speed calculation lesson 5: Running totals · Set 240 · 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. 1.13 + 40 + 28 + 79 =
  2. 2.62 + 69 + 63 + 56 =
  3. 3.75 + 79 + 26 + 42 =
  4. 4.27 + 12 + 12 + 11 =
  5. 5.41 + 13 + 37 + 79 =
  6. 6.86 + 52 + 50 + 20 =
  7. 7.37 + 49 + 44 + 78 =
  8. 8.67 + 85 + 19 + 82 =
  9. 9.52 + 18 + 43 + 20 =
  10. 10.38 + 51 + 57 + 12 =
  11. 11.17 + 36 + 17 + 32 =
  12. 12.86 + 12 + 14 + 42 =
  13. 13.61 + 31 + 31 + 65 =
  14. 14.59 + 70 + 73 + 72 =
  15. 15.73 + 39 + 33 + 25 =
  16. 16.45 + 89 + 22 + 34 =
  17. 17.39 + 49 + 20 + 63 =
  18. 18.33 + 42 + 33 + 21 =
  19. 19.19 + 38 + 62 + 40 =
  20. 20.41 + 73 + 26 + 68 =
  21. 21.33 + 21 + 46 + 71 =
  22. 22.21 + 36 + 38 + 27 =
  23. 23.30 + 19 + 16 + 12 =
  24. 24.11 + 11 + 41 + 21 =
  25. 25.62 + 36 + 20 + 69 =
  26. 26.63 + 64 + 47 + 68 =
  27. 27.88 + 82 + 37 + 50 =
  28. 28.85 + 29 + 65 + 81 =
  29. 29.83 + 12 + 24 + 61 =
  30. 30.83 + 46 + 48 + 21 =
  31. 31.33 + 38 + 83 + 62 =
  32. 32.82 + 65 + 89 + 87 =
  33. 33.88 + 42 + 68 + 41 =
  34. 34.53 + 35 + 22 + 84 =
  35. 35.67 + 25 + 41 + 33 =
  36. 36.57 + 48 + 55 + 76 =
  37. 37.46 + 77 + 83 + 43 =
  38. 38.50 + 77 + 80 + 57 =
  39. 39.67 + 51 + 60 + 64 =
  40. 40.26 + 33 + 63 + 55 =

Answer key

  1. 160
  2. 250
  3. 222
  4. 62
  5. 170
  6. 208
  7. 208
  8. 253
  9. 133
  10. 158
  11. 102
  12. 154
  13. 188
  14. 274
  15. 170
  16. 190
  17. 171
  18. 129
  19. 159
  20. 208
  21. 171
  22. 122
  23. 77
  24. 84
  25. 187
  26. 242
  27. 257
  28. 260
  29. 180
  30. 198
  31. 216
  32. 323
  33. 239
  34. 194
  35. 166
  36. 236
  37. 249
  38. 264
  39. 242
  40. 177

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