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Mental Addition Worksheet

Speed calculation lesson 5: Running totals · Set 420 · 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. 1.57 + 74 + 84 + 15 =
  2. 2.70 + 81 + 17 + 34 =
  3. 3.62 + 74 + 15 + 84 =
  4. 4.38 + 30 + 23 + 18 =
  5. 5.75 + 47 + 59 + 32 =
  6. 6.76 + 66 + 47 + 89 =
  7. 7.17 + 80 + 46 + 81 =
  8. 8.82 + 89 + 23 + 75 =
  9. 9.43 + 59 + 50 + 65 =
  10. 10.68 + 63 + 50 + 76 =
  11. 11.28 + 42 + 62 + 35 =
  12. 12.29 + 85 + 30 + 12 =
  13. 13.41 + 38 + 51 + 19 =
  14. 14.64 + 18 + 44 + 60 =
  15. 15.84 + 34 + 23 + 51 =
  16. 16.22 + 82 + 42 + 78 =
  17. 17.18 + 77 + 35 + 26 =
  18. 18.51 + 61 + 19 + 44 =
  19. 19.77 + 25 + 51 + 63 =
  20. 20.66 + 12 + 36 + 59 =
  21. 21.21 + 12 + 87 + 39 =
  22. 22.20 + 34 + 22 + 23 =
  23. 23.66 + 33 + 78 + 12 =
  24. 24.81 + 43 + 77 + 68 =
  25. 25.67 + 26 + 34 + 61 =
  26. 26.52 + 37 + 49 + 32 =
  27. 27.70 + 21 + 56 + 25 =
  28. 28.65 + 70 + 27 + 53 =
  29. 29.44 + 34 + 14 + 78 =
  30. 30.12 + 28 + 21 + 40 =
  31. 31.23 + 79 + 43 + 22 =
  32. 32.38 + 45 + 70 + 48 =
  33. 33.27 + 17 + 44 + 75 =
  34. 34.73 + 43 + 17 + 63 =
  35. 35.28 + 54 + 63 + 42 =
  36. 36.23 + 82 + 19 + 28 =
  37. 37.35 + 53 + 56 + 43 =
  38. 38.34 + 81 + 20 + 23 =
  39. 39.45 + 18 + 35 + 48 =
  40. 40.32 + 82 + 45 + 56 =

Answer key

  1. 230
  2. 202
  3. 235
  4. 109
  5. 213
  6. 278
  7. 224
  8. 269
  9. 217
  10. 257
  11. 167
  12. 156
  13. 149
  14. 186
  15. 192
  16. 224
  17. 156
  18. 175
  19. 216
  20. 173
  21. 159
  22. 99
  23. 189
  24. 269
  25. 188
  26. 170
  27. 172
  28. 215
  29. 170
  30. 101
  31. 167
  32. 201
  33. 163
  34. 196
  35. 187
  36. 152
  37. 187
  38. 158
  39. 146
  40. 215

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