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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 897 · 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. 1.136 + 87 =
  2. 2.309 + 27 =
  3. 3.65 + 67 =
  4. 4.317 + 57 =
  5. 5.403 + 59 =
  6. 6.173 + 97 =
  7. 7.416 + 98 =
  8. 8.475 + 48 =
  9. 9.294 + 28 =
  10. 10.126 + 29 =
  11. 11.153 + 28 =
  12. 12.162 + 27 =
  13. 13.47 + 29 =
  14. 14.420 + 37 =
  15. 15.232 + 77 =
  16. 16.134 + 88 =
  17. 17.382 + 88 =
  18. 18.499 + 87 =
  19. 19.78 + 78 =
  20. 20.445 + 38 =
  21. 21.244 + 98 =
  22. 22.45 + 29 =
  23. 23.253 + 27 =
  24. 24.422 + 38 =
  25. 25.317 + 19 =
  26. 26.68 + 48 =
  27. 27.348 + 49 =
  28. 28.462 + 78 =
  29. 29.219 + 77 =
  30. 30.75 + 28 =
  31. 31.103 + 17 =
  32. 32.334 + 68 =
  33. 33.294 + 68 =
  34. 34.163 + 19 =
  35. 35.49 + 77 =
  36. 36.273 + 98 =
  37. 37.471 + 98 =
  38. 38.114 + 17 =
  39. 39.286 + 69 =
  40. 40.168 + 87 =

Answer key

  1. 223
  2. 336
  3. 132
  4. 374
  5. 462
  6. 270
  7. 514
  8. 523
  9. 322
  10. 155
  11. 181
  12. 189
  13. 76
  14. 457
  15. 309
  16. 222
  17. 470
  18. 586
  19. 156
  20. 483
  21. 342
  22. 74
  23. 280
  24. 460
  25. 336
  26. 116
  27. 397
  28. 540
  29. 296
  30. 103
  31. 120
  32. 402
  33. 362
  34. 182
  35. 126
  36. 371
  37. 569
  38. 131
  39. 355
  40. 255

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