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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 997 · 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. 1.457 + 38 =
  2. 2.31 + 47 =
  3. 3.103 + 17 =
  4. 4.36 + 39 =
  5. 5.133 + 98 =
  6. 6.318 + 79 =
  7. 7.274 + 87 =
  8. 8.195 + 89 =
  9. 9.432 + 19 =
  10. 10.421 + 47 =
  11. 11.175 + 37 =
  12. 12.120 + 78 =
  13. 13.480 + 17 =
  14. 14.103 + 27 =
  15. 15.381 + 87 =
  16. 16.26 + 39 =
  17. 17.423 + 27 =
  18. 18.126 + 97 =
  19. 19.380 + 59 =
  20. 20.477 + 29 =
  21. 21.256 + 29 =
  22. 22.409 + 18 =
  23. 23.186 + 68 =
  24. 24.146 + 27 =
  25. 25.340 + 28 =
  26. 26.391 + 99 =
  27. 27.235 + 38 =
  28. 28.395 + 69 =
  29. 29.216 + 37 =
  30. 30.399 + 88 =
  31. 31.82 + 28 =
  32. 32.424 + 18 =
  33. 33.419 + 48 =
  34. 34.299 + 29 =
  35. 35.322 + 48 =
  36. 36.495 + 89 =
  37. 37.464 + 78 =
  38. 38.418 + 68 =
  39. 39.267 + 18 =
  40. 40.68 + 79 =

Answer key

  1. 495
  2. 78
  3. 120
  4. 75
  5. 231
  6. 397
  7. 361
  8. 284
  9. 451
  10. 468
  11. 212
  12. 198
  13. 497
  14. 130
  15. 468
  16. 65
  17. 450
  18. 223
  19. 439
  20. 506
  21. 285
  22. 427
  23. 254
  24. 173
  25. 368
  26. 490
  27. 273
  28. 464
  29. 253
  30. 487
  31. 110
  32. 442
  33. 467
  34. 328
  35. 370
  36. 584
  37. 542
  38. 486
  39. 285
  40. 147

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