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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 789 · 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. 1.38 + 49 =
  2. 2.134 + 37 =
  3. 3.118 + 98 =
  4. 4.105 + 97 =
  5. 5.259 + 28 =
  6. 6.453 + 49 =
  7. 7.272 + 67 =
  8. 8.193 + 59 =
  9. 9.261 + 79 =
  10. 10.70 + 38 =
  11. 11.467 + 48 =
  12. 12.496 + 17 =
  13. 13.430 + 98 =
  14. 14.430 + 57 =
  15. 15.317 + 69 =
  16. 16.247 + 68 =
  17. 17.423 + 98 =
  18. 18.357 + 38 =
  19. 19.29 + 18 =
  20. 20.382 + 17 =
  21. 21.395 + 59 =
  22. 22.353 + 79 =
  23. 23.423 + 69 =
  24. 24.305 + 37 =
  25. 25.39 + 78 =
  26. 26.400 + 18 =
  27. 27.295 + 89 =
  28. 28.115 + 67 =
  29. 29.450 + 79 =
  30. 30.74 + 97 =
  31. 31.423 + 27 =
  32. 32.279 + 69 =
  33. 33.446 + 69 =
  34. 34.175 + 87 =
  35. 35.35 + 17 =
  36. 36.460 + 67 =
  37. 37.148 + 19 =
  38. 38.253 + 87 =
  39. 39.47 + 39 =
  40. 40.403 + 48 =

Answer key

  1. 87
  2. 171
  3. 216
  4. 202
  5. 287
  6. 502
  7. 339
  8. 252
  9. 340
  10. 108
  11. 515
  12. 513
  13. 528
  14. 487
  15. 386
  16. 315
  17. 521
  18. 395
  19. 47
  20. 399
  21. 454
  22. 432
  23. 492
  24. 342
  25. 117
  26. 418
  27. 384
  28. 182
  29. 529
  30. 171
  31. 450
  32. 348
  33. 515
  34. 262
  35. 52
  36. 527
  37. 167
  38. 340
  39. 86
  40. 451

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