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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 344 · 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. 1.135 + 78 =
  2. 2.211 + 79 =
  3. 3.154 + 89 =
  4. 4.450 + 79 =
  5. 5.139 + 78 =
  6. 6.307 + 19 =
  7. 7.243 + 77 =
  8. 8.488 + 29 =
  9. 9.470 + 37 =
  10. 10.381 + 49 =
  11. 11.36 + 49 =
  12. 12.235 + 28 =
  13. 13.483 + 99 =
  14. 14.59 + 99 =
  15. 15.200 + 57 =
  16. 16.94 + 78 =
  17. 17.271 + 27 =
  18. 18.99 + 57 =
  19. 19.440 + 18 =
  20. 20.237 + 77 =
  21. 21.321 + 78 =
  22. 22.315 + 37 =
  23. 23.404 + 57 =
  24. 24.341 + 68 =
  25. 25.55 + 98 =
  26. 26.475 + 18 =
  27. 27.293 + 59 =
  28. 28.107 + 37 =
  29. 29.230 + 59 =
  30. 30.192 + 18 =
  31. 31.450 + 38 =
  32. 32.342 + 87 =
  33. 33.470 + 88 =
  34. 34.31 + 47 =
  35. 35.474 + 57 =
  36. 36.351 + 49 =
  37. 37.416 + 69 =
  38. 38.226 + 78 =
  39. 39.469 + 89 =
  40. 40.48 + 48 =

Answer key

  1. 213
  2. 290
  3. 243
  4. 529
  5. 217
  6. 326
  7. 320
  8. 517
  9. 507
  10. 430
  11. 85
  12. 263
  13. 582
  14. 158
  15. 257
  16. 172
  17. 298
  18. 156
  19. 458
  20. 314
  21. 399
  22. 352
  23. 461
  24. 409
  25. 153
  26. 493
  27. 352
  28. 144
  29. 289
  30. 210
  31. 488
  32. 429
  33. 558
  34. 78
  35. 531
  36. 400
  37. 485
  38. 304
  39. 558
  40. 96

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