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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 676 · 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. 1.27 + 29 =
  2. 2.475 + 59 =
  3. 3.28 + 19 =
  4. 4.343 + 48 =
  5. 5.159 + 28 =
  6. 6.121 + 29 =
  7. 7.27 + 78 =
  8. 8.408 + 49 =
  9. 9.39 + 27 =
  10. 10.102 + 49 =
  11. 11.130 + 27 =
  12. 12.488 + 67 =
  13. 13.361 + 77 =
  14. 14.365 + 67 =
  15. 15.322 + 49 =
  16. 16.107 + 79 =
  17. 17.153 + 18 =
  18. 18.281 + 58 =
  19. 19.210 + 87 =
  20. 20.409 + 57 =
  21. 21.447 + 49 =
  22. 22.376 + 29 =
  23. 23.460 + 99 =
  24. 24.128 + 39 =
  25. 25.488 + 37 =
  26. 26.428 + 49 =
  27. 27.379 + 78 =
  28. 28.457 + 17 =
  29. 29.421 + 99 =
  30. 30.222 + 89 =
  31. 31.289 + 18 =
  32. 32.261 + 59 =
  33. 33.287 + 49 =
  34. 34.320 + 97 =
  35. 35.415 + 19 =
  36. 36.365 + 39 =
  37. 37.172 + 87 =
  38. 38.109 + 37 =
  39. 39.478 + 17 =
  40. 40.373 + 68 =

Answer key

  1. 56
  2. 534
  3. 47
  4. 391
  5. 187
  6. 150
  7. 105
  8. 457
  9. 66
  10. 151
  11. 157
  12. 555
  13. 438
  14. 432
  15. 371
  16. 186
  17. 171
  18. 339
  19. 297
  20. 466
  21. 496
  22. 405
  23. 559
  24. 167
  25. 525
  26. 477
  27. 457
  28. 474
  29. 520
  30. 311
  31. 307
  32. 320
  33. 336
  34. 417
  35. 434
  36. 404
  37. 259
  38. 146
  39. 495
  40. 441

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