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Mental Addition Worksheet

Speed calculation lesson 5: Running totals · Set 360 · 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. 1.87 + 17 + 21 + 40 =
  2. 2.75 + 20 + 47 + 18 =
  3. 3.61 + 12 + 73 + 63 =
  4. 4.72 + 78 + 30 + 17 =
  5. 5.20 + 72 + 55 + 33 =
  6. 6.77 + 64 + 59 + 18 =
  7. 7.84 + 40 + 31 + 87 =
  8. 8.17 + 11 + 17 + 11 =
  9. 9.70 + 77 + 22 + 58 =
  10. 10.55 + 46 + 35 + 12 =
  11. 11.23 + 42 + 61 + 79 =
  12. 12.72 + 73 + 31 + 28 =
  13. 13.20 + 55 + 79 + 42 =
  14. 14.66 + 18 + 45 + 57 =
  15. 15.26 + 67 + 87 + 68 =
  16. 16.57 + 65 + 77 + 42 =
  17. 17.80 + 38 + 47 + 80 =
  18. 18.39 + 81 + 37 + 36 =
  19. 19.12 + 49 + 66 + 11 =
  20. 20.21 + 16 + 37 + 34 =
  21. 21.69 + 37 + 11 + 15 =
  22. 22.51 + 23 + 32 + 27 =
  23. 23.72 + 65 + 20 + 17 =
  24. 24.76 + 31 + 61 + 29 =
  25. 25.13 + 26 + 28 + 13 =
  26. 26.31 + 74 + 77 + 60 =
  27. 27.61 + 63 + 83 + 29 =
  28. 28.54 + 38 + 52 + 23 =
  29. 29.19 + 11 + 15 + 42 =
  30. 30.18 + 25 + 48 + 14 =
  31. 31.78 + 34 + 58 + 69 =
  32. 32.18 + 61 + 72 + 85 =
  33. 33.86 + 83 + 47 + 63 =
  34. 34.50 + 81 + 50 + 12 =
  35. 35.52 + 67 + 66 + 57 =
  36. 36.19 + 51 + 70 + 65 =
  37. 37.74 + 24 + 15 + 15 =
  38. 38.39 + 13 + 40 + 81 =
  39. 39.13 + 17 + 21 + 19 =
  40. 40.46 + 82 + 64 + 28 =

Answer key

  1. 165
  2. 160
  3. 209
  4. 197
  5. 180
  6. 218
  7. 242
  8. 56
  9. 227
  10. 148
  11. 205
  12. 204
  13. 196
  14. 186
  15. 248
  16. 241
  17. 245
  18. 193
  19. 138
  20. 108
  21. 132
  22. 133
  23. 174
  24. 197
  25. 80
  26. 242
  27. 236
  28. 167
  29. 87
  30. 105
  31. 239
  32. 236
  33. 279
  34. 193
  35. 242
  36. 205
  37. 128
  38. 173
  39. 70
  40. 220

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