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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 909 · 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. 1.249 + 78 =
  2. 2.445 + 79 =
  3. 3.140 + 99 =
  4. 4.75 + 99 =
  5. 5.235 + 77 =
  6. 6.175 + 77 =
  7. 7.130 + 78 =
  8. 8.134 + 29 =
  9. 9.408 + 29 =
  10. 10.79 + 79 =
  11. 11.267 + 48 =
  12. 12.42 + 18 =
  13. 13.246 + 98 =
  14. 14.415 + 78 =
  15. 15.498 + 27 =
  16. 16.326 + 98 =
  17. 17.55 + 49 =
  18. 18.353 + 29 =
  19. 19.228 + 57 =
  20. 20.395 + 29 =
  21. 21.244 + 98 =
  22. 22.460 + 27 =
  23. 23.126 + 27 =
  24. 24.100 + 89 =
  25. 25.410 + 38 =
  26. 26.309 + 79 =
  27. 27.283 + 28 =
  28. 28.135 + 47 =
  29. 29.330 + 18 =
  30. 30.489 + 28 =
  31. 31.83 + 68 =
  32. 32.287 + 39 =
  33. 33.319 + 87 =
  34. 34.90 + 27 =
  35. 35.313 + 77 =
  36. 36.334 + 39 =
  37. 37.191 + 98 =
  38. 38.412 + 49 =
  39. 39.83 + 39 =
  40. 40.201 + 47 =

Answer key

  1. 327
  2. 524
  3. 239
  4. 174
  5. 312
  6. 252
  7. 208
  8. 163
  9. 437
  10. 158
  11. 315
  12. 60
  13. 344
  14. 493
  15. 525
  16. 424
  17. 104
  18. 382
  19. 285
  20. 424
  21. 342
  22. 487
  23. 153
  24. 189
  25. 448
  26. 388
  27. 311
  28. 182
  29. 348
  30. 517
  31. 151
  32. 326
  33. 406
  34. 117
  35. 390
  36. 373
  37. 289
  38. 461
  39. 122
  40. 248

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