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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 280 · 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. 1.347 + 49 =
  2. 2.193 + 87 =
  3. 3.228 + 27 =
  4. 4.340 + 47 =
  5. 5.205 + 39 =
  6. 6.203 + 67 =
  7. 7.81 + 27 =
  8. 8.351 + 77 =
  9. 9.186 + 17 =
  10. 10.486 + 38 =
  11. 11.421 + 57 =
  12. 12.447 + 38 =
  13. 13.475 + 57 =
  14. 14.74 + 89 =
  15. 15.352 + 79 =
  16. 16.370 + 59 =
  17. 17.33 + 68 =
  18. 18.304 + 48 =
  19. 19.347 + 67 =
  20. 20.499 + 77 =
  21. 21.348 + 59 =
  22. 22.79 + 59 =
  23. 23.393 + 59 =
  24. 24.439 + 79 =
  25. 25.35 + 29 =
  26. 26.276 + 39 =
  27. 27.493 + 37 =
  28. 28.409 + 69 =
  29. 29.437 + 69 =
  30. 30.470 + 59 =
  31. 31.237 + 58 =
  32. 32.250 + 38 =
  33. 33.149 + 48 =
  34. 34.494 + 58 =
  35. 35.67 + 99 =
  36. 36.155 + 87 =
  37. 37.400 + 79 =
  38. 38.337 + 37 =
  39. 39.58 + 17 =
  40. 40.462 + 48 =

Answer key

  1. 396
  2. 280
  3. 255
  4. 387
  5. 244
  6. 270
  7. 108
  8. 428
  9. 203
  10. 524
  11. 478
  12. 485
  13. 532
  14. 163
  15. 431
  16. 429
  17. 101
  18. 352
  19. 414
  20. 576
  21. 407
  22. 138
  23. 452
  24. 518
  25. 64
  26. 315
  27. 530
  28. 478
  29. 506
  30. 529
  31. 295
  32. 288
  33. 197
  34. 552
  35. 166
  36. 242
  37. 479
  38. 374
  39. 75
  40. 510

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