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Mental Addition Worksheet

Speed calculation lesson 5: Running totals · Set 667 · 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. 1.25 + 21 + 21 + 82 =
  2. 2.49 + 76 + 60 + 73 =
  3. 3.48 + 14 + 15 + 70 =
  4. 4.71 + 39 + 28 + 37 =
  5. 5.45 + 61 + 20 + 79 =
  6. 6.38 + 52 + 20 + 27 =
  7. 7.89 + 13 + 31 + 11 =
  8. 8.15 + 31 + 50 + 65 =
  9. 9.27 + 82 + 83 + 30 =
  10. 10.76 + 65 + 36 + 85 =
  11. 11.26 + 79 + 43 + 53 =
  12. 12.30 + 44 + 87 + 39 =
  13. 13.80 + 77 + 14 + 61 =
  14. 14.36 + 80 + 76 + 32 =
  15. 15.40 + 72 + 18 + 86 =
  16. 16.79 + 62 + 23 + 64 =
  17. 17.67 + 46 + 13 + 71 =
  18. 18.70 + 31 + 11 + 51 =
  19. 19.74 + 87 + 40 + 29 =
  20. 20.41 + 34 + 24 + 13 =
  21. 21.15 + 51 + 53 + 78 =
  22. 22.80 + 81 + 80 + 52 =
  23. 23.64 + 50 + 66 + 63 =
  24. 24.43 + 84 + 18 + 40 =
  25. 25.57 + 68 + 64 + 20 =
  26. 26.63 + 12 + 18 + 17 =
  27. 27.17 + 58 + 25 + 39 =
  28. 28.22 + 45 + 34 + 80 =
  29. 29.27 + 43 + 13 + 62 =
  30. 30.34 + 69 + 87 + 40 =
  31. 31.12 + 31 + 29 + 36 =
  32. 32.50 + 15 + 42 + 18 =
  33. 33.51 + 64 + 18 + 71 =
  34. 34.17 + 76 + 18 + 86 =
  35. 35.60 + 76 + 62 + 70 =
  36. 36.89 + 35 + 14 + 79 =
  37. 37.66 + 26 + 52 + 79 =
  38. 38.14 + 13 + 23 + 31 =
  39. 39.26 + 75 + 72 + 61 =
  40. 40.77 + 30 + 79 + 47 =

Answer key

  1. 149
  2. 258
  3. 147
  4. 175
  5. 205
  6. 137
  7. 144
  8. 161
  9. 222
  10. 262
  11. 201
  12. 200
  13. 232
  14. 224
  15. 216
  16. 228
  17. 197
  18. 163
  19. 230
  20. 112
  21. 197
  22. 293
  23. 243
  24. 185
  25. 209
  26. 110
  27. 139
  28. 181
  29. 145
  30. 230
  31. 108
  32. 125
  33. 204
  34. 197
  35. 268
  36. 217
  37. 223
  38. 81
  39. 234
  40. 233

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