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Mental Addition Worksheet

Speed calculation lesson 5: Running totals · Set 451 · 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 + 77 + 28 + 39 =
  2. 2.11 + 12 + 49 + 51 =
  3. 3.16 + 47 + 89 + 55 =
  4. 4.21 + 27 + 20 + 28 =
  5. 5.37 + 30 + 46 + 39 =
  6. 6.17 + 14 + 24 + 78 =
  7. 7.37 + 12 + 34 + 83 =
  8. 8.68 + 86 + 16 + 20 =
  9. 9.51 + 44 + 39 + 86 =
  10. 10.44 + 80 + 18 + 17 =
  11. 11.89 + 87 + 75 + 82 =
  12. 12.24 + 13 + 88 + 46 =
  13. 13.87 + 72 + 51 + 70 =
  14. 14.62 + 21 + 57 + 19 =
  15. 15.61 + 11 + 67 + 23 =
  16. 16.67 + 55 + 45 + 30 =
  17. 17.16 + 84 + 54 + 20 =
  18. 18.26 + 43 + 11 + 30 =
  19. 19.40 + 66 + 30 + 88 =
  20. 20.11 + 55 + 31 + 56 =
  21. 21.21 + 29 + 64 + 70 =
  22. 22.62 + 64 + 70 + 36 =
  23. 23.17 + 59 + 42 + 73 =
  24. 24.66 + 48 + 78 + 48 =
  25. 25.19 + 15 + 43 + 67 =
  26. 26.35 + 13 + 74 + 66 =
  27. 27.43 + 14 + 15 + 15 =
  28. 28.42 + 27 + 33 + 76 =
  29. 29.12 + 34 + 77 + 41 =
  30. 30.16 + 33 + 40 + 25 =
  31. 31.12 + 58 + 82 + 30 =
  32. 32.15 + 50 + 39 + 40 =
  33. 33.37 + 62 + 88 + 72 =
  34. 34.46 + 25 + 20 + 41 =
  35. 35.64 + 88 + 62 + 37 =
  36. 36.16 + 35 + 60 + 11 =
  37. 37.78 + 51 + 34 + 16 =
  38. 38.72 + 70 + 31 + 56 =
  39. 39.25 + 23 + 63 + 30 =
  40. 40.27 + 48 + 80 + 60 =

Answer key

  1. 207
  2. 123
  3. 207
  4. 96
  5. 152
  6. 133
  7. 166
  8. 190
  9. 220
  10. 159
  11. 333
  12. 171
  13. 280
  14. 159
  15. 162
  16. 197
  17. 174
  18. 110
  19. 224
  20. 153
  21. 184
  22. 232
  23. 191
  24. 240
  25. 144
  26. 188
  27. 87
  28. 178
  29. 164
  30. 114
  31. 182
  32. 144
  33. 259
  34. 132
  35. 251
  36. 122
  37. 179
  38. 229
  39. 141
  40. 215

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