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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 989 · 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. 1.394 + 99 =
  2. 2.407 + 59 =
  3. 3.335 + 49 =
  4. 4.485 + 87 =
  5. 5.395 + 87 =
  6. 6.479 + 18 =
  7. 7.444 + 17 =
  8. 8.263 + 37 =
  9. 9.466 + 79 =
  10. 10.132 + 59 =
  11. 11.313 + 57 =
  12. 12.388 + 28 =
  13. 13.380 + 37 =
  14. 14.350 + 37 =
  15. 15.346 + 37 =
  16. 16.358 + 59 =
  17. 17.220 + 27 =
  18. 18.325 + 47 =
  19. 19.228 + 27 =
  20. 20.470 + 77 =
  21. 21.286 + 98 =
  22. 22.145 + 47 =
  23. 23.227 + 39 =
  24. 24.471 + 48 =
  25. 25.247 + 59 =
  26. 26.383 + 99 =
  27. 27.358 + 79 =
  28. 28.390 + 78 =
  29. 29.35 + 98 =
  30. 30.451 + 58 =
  31. 31.241 + 38 =
  32. 32.154 + 19 =
  33. 33.339 + 38 =
  34. 34.112 + 49 =
  35. 35.437 + 89 =
  36. 36.295 + 39 =
  37. 37.349 + 88 =
  38. 38.468 + 38 =
  39. 39.322 + 69 =
  40. 40.360 + 97 =

Answer key

  1. 493
  2. 466
  3. 384
  4. 572
  5. 482
  6. 497
  7. 461
  8. 300
  9. 545
  10. 191
  11. 370
  12. 416
  13. 417
  14. 387
  15. 383
  16. 417
  17. 247
  18. 372
  19. 255
  20. 547
  21. 384
  22. 192
  23. 266
  24. 519
  25. 306
  26. 482
  27. 437
  28. 468
  29. 133
  30. 509
  31. 279
  32. 173
  33. 377
  34. 161
  35. 526
  36. 334
  37. 437
  38. 506
  39. 391
  40. 457

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