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Mental Addition Worksheet

Speed calculation lesson 5: Running totals · Set 810 · 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. 1.39 + 25 + 26 + 18 =
  2. 2.54 + 12 + 22 + 36 =
  3. 3.69 + 57 + 61 + 70 =
  4. 4.79 + 41 + 65 + 88 =
  5. 5.19 + 13 + 13 + 12 =
  6. 6.19 + 16 + 24 + 78 =
  7. 7.49 + 89 + 61 + 15 =
  8. 8.44 + 41 + 15 + 79 =
  9. 9.81 + 40 + 30 + 73 =
  10. 10.22 + 21 + 23 + 88 =
  11. 11.51 + 75 + 35 + 56 =
  12. 12.85 + 13 + 74 + 83 =
  13. 13.37 + 60 + 18 + 24 =
  14. 14.42 + 39 + 80 + 75 =
  15. 15.31 + 21 + 85 + 15 =
  16. 16.35 + 34 + 22 + 31 =
  17. 17.25 + 67 + 73 + 74 =
  18. 18.23 + 38 + 53 + 79 =
  19. 19.24 + 67 + 68 + 43 =
  20. 20.67 + 32 + 14 + 17 =
  21. 21.72 + 45 + 38 + 33 =
  22. 22.25 + 64 + 88 + 39 =
  23. 23.71 + 34 + 27 + 29 =
  24. 24.89 + 71 + 42 + 55 =
  25. 25.29 + 77 + 42 + 37 =
  26. 26.57 + 56 + 15 + 32 =
  27. 27.73 + 16 + 56 + 39 =
  28. 28.82 + 40 + 57 + 71 =
  29. 29.42 + 36 + 78 + 28 =
  30. 30.55 + 83 + 63 + 59 =
  31. 31.18 + 33 + 29 + 74 =
  32. 32.54 + 77 + 81 + 21 =
  33. 33.20 + 47 + 56 + 28 =
  34. 34.20 + 39 + 85 + 58 =
  35. 35.73 + 43 + 78 + 12 =
  36. 36.43 + 25 + 78 + 55 =
  37. 37.27 + 12 + 79 + 53 =
  38. 38.22 + 44 + 80 + 54 =
  39. 39.60 + 74 + 50 + 54 =
  40. 40.27 + 42 + 38 + 46 =

Answer key

  1. 108
  2. 124
  3. 257
  4. 273
  5. 57
  6. 137
  7. 214
  8. 179
  9. 224
  10. 154
  11. 217
  12. 255
  13. 139
  14. 236
  15. 152
  16. 122
  17. 239
  18. 193
  19. 202
  20. 130
  21. 188
  22. 216
  23. 161
  24. 257
  25. 185
  26. 160
  27. 184
  28. 250
  29. 184
  30. 260
  31. 154
  32. 233
  33. 151
  34. 202
  35. 206
  36. 201
  37. 171
  38. 200
  39. 238
  40. 153

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