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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 863 · 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. 1.424 + 59 =
  2. 2.64 + 78 =
  3. 3.486 + 98 =
  4. 4.124 + 68 =
  5. 5.386 + 39 =
  6. 6.51 + 47 =
  7. 7.383 + 89 =
  8. 8.324 + 38 =
  9. 9.177 + 78 =
  10. 10.391 + 49 =
  11. 11.175 + 29 =
  12. 12.297 + 59 =
  13. 13.65 + 99 =
  14. 14.491 + 79 =
  15. 15.121 + 38 =
  16. 16.58 + 87 =
  17. 17.445 + 48 =
  18. 18.72 + 17 =
  19. 19.495 + 89 =
  20. 20.394 + 27 =
  21. 21.216 + 99 =
  22. 22.123 + 47 =
  23. 23.89 + 38 =
  24. 24.26 + 29 =
  25. 25.288 + 97 =
  26. 26.401 + 47 =
  27. 27.360 + 98 =
  28. 28.398 + 78 =
  29. 29.433 + 29 =
  30. 30.343 + 99 =
  31. 31.388 + 78 =
  32. 32.349 + 59 =
  33. 33.58 + 87 =
  34. 34.472 + 29 =
  35. 35.323 + 79 =
  36. 36.90 + 88 =
  37. 37.204 + 59 =
  38. 38.343 + 59 =
  39. 39.134 + 58 =
  40. 40.218 + 59 =

Answer key

  1. 483
  2. 142
  3. 584
  4. 192
  5. 425
  6. 98
  7. 472
  8. 362
  9. 255
  10. 440
  11. 204
  12. 356
  13. 164
  14. 570
  15. 159
  16. 145
  17. 493
  18. 89
  19. 584
  20. 421
  21. 315
  22. 170
  23. 127
  24. 55
  25. 385
  26. 448
  27. 458
  28. 476
  29. 462
  30. 442
  31. 466
  32. 408
  33. 145
  34. 501
  35. 402
  36. 178
  37. 263
  38. 402
  39. 192
  40. 277

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