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Mental Addition Worksheet

Speed calculation lesson 5: Running totals · Set 625 · 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. 1.74 + 16 + 81 + 34 =
  2. 2.24 + 24 + 34 + 80 =
  3. 3.37 + 33 + 24 + 78 =
  4. 4.66 + 31 + 45 + 21 =
  5. 5.34 + 24 + 29 + 28 =
  6. 6.74 + 29 + 27 + 42 =
  7. 7.11 + 42 + 24 + 26 =
  8. 8.50 + 21 + 18 + 84 =
  9. 9.29 + 45 + 59 + 21 =
  10. 10.46 + 22 + 27 + 29 =
  11. 11.44 + 86 + 25 + 23 =
  12. 12.59 + 34 + 40 + 52 =
  13. 13.47 + 89 + 31 + 21 =
  14. 14.86 + 16 + 43 + 23 =
  15. 15.89 + 41 + 24 + 45 =
  16. 16.35 + 33 + 65 + 54 =
  17. 17.46 + 30 + 64 + 68 =
  18. 18.27 + 36 + 18 + 12 =
  19. 19.80 + 86 + 75 + 62 =
  20. 20.53 + 17 + 65 + 15 =
  21. 21.12 + 65 + 26 + 21 =
  22. 22.86 + 39 + 20 + 15 =
  23. 23.12 + 43 + 80 + 51 =
  24. 24.59 + 21 + 85 + 33 =
  25. 25.48 + 48 + 46 + 79 =
  26. 26.33 + 69 + 40 + 70 =
  27. 27.22 + 39 + 62 + 27 =
  28. 28.52 + 68 + 52 + 15 =
  29. 29.44 + 43 + 83 + 15 =
  30. 30.13 + 42 + 74 + 32 =
  31. 31.80 + 19 + 33 + 28 =
  32. 32.55 + 50 + 58 + 67 =
  33. 33.37 + 17 + 78 + 82 =
  34. 34.75 + 23 + 27 + 23 =
  35. 35.66 + 47 + 27 + 82 =
  36. 36.18 + 85 + 26 + 76 =
  37. 37.38 + 24 + 15 + 35 =
  38. 38.40 + 58 + 26 + 50 =
  39. 39.37 + 40 + 79 + 74 =
  40. 40.51 + 43 + 76 + 85 =

Answer key

  1. 205
  2. 162
  3. 172
  4. 163
  5. 115
  6. 172
  7. 103
  8. 173
  9. 154
  10. 124
  11. 178
  12. 185
  13. 188
  14. 168
  15. 199
  16. 187
  17. 208
  18. 93
  19. 303
  20. 150
  21. 124
  22. 160
  23. 186
  24. 198
  25. 221
  26. 212
  27. 150
  28. 187
  29. 185
  30. 161
  31. 160
  32. 230
  33. 214
  34. 148
  35. 222
  36. 205
  37. 112
  38. 174
  39. 230
  40. 255

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