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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 594 · 40 questions
TalentJR

The fast method (Round up, then fix): Round the number ending in 7, 8 or 9 up to the next ten: 39 → 40. Add the round number. Take away the extra you added (here 1).

NameDateTime takenScore ___ / 40
  1. 1.198 + 27 =
  2. 2.368 + 38 =
  3. 3.51 + 78 =
  4. 4.410 + 27 =
  5. 5.439 + 27 =
  6. 6.439 + 78 =
  7. 7.61 + 29 =
  8. 8.462 + 37 =
  9. 9.65 + 77 =
  10. 10.163 + 19 =
  11. 11.433 + 37 =
  12. 12.374 + 58 =
  13. 13.146 + 17 =
  14. 14.316 + 27 =
  15. 15.41 + 88 =
  16. 16.67 + 69 =
  17. 17.54 + 89 =
  18. 18.260 + 88 =
  19. 19.498 + 39 =
  20. 20.405 + 18 =
  21. 21.26 + 18 =
  22. 22.360 + 87 =
  23. 23.337 + 37 =
  24. 24.29 + 58 =
  25. 25.470 + 49 =
  26. 26.86 + 17 =
  27. 27.257 + 89 =
  28. 28.119 + 59 =
  29. 29.337 + 78 =
  30. 30.402 + 49 =
  31. 31.474 + 67 =
  32. 32.362 + 19 =
  33. 33.475 + 17 =
  34. 34.287 + 28 =
  35. 35.355 + 87 =
  36. 36.118 + 89 =
  37. 37.314 + 78 =
  38. 38.83 + 87 =
  39. 39.325 + 97 =
  40. 40.195 + 49 =

Answer key

  1. 225
  2. 406
  3. 129
  4. 437
  5. 466
  6. 517
  7. 90
  8. 499
  9. 142
  10. 182
  11. 470
  12. 432
  13. 163
  14. 343
  15. 129
  16. 136
  17. 143
  18. 348
  19. 537
  20. 423
  21. 44
  22. 447
  23. 374
  24. 87
  25. 519
  26. 103
  27. 346
  28. 178
  29. 415
  30. 451
  31. 541
  32. 381
  33. 492
  34. 315
  35. 442
  36. 207
  37. 392
  38. 170
  39. 422
  40. 244

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