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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 993 · 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. 1.462 + 29 =
  2. 2.259 + 57 =
  3. 3.195 + 18 =
  4. 4.256 + 48 =
  5. 5.372 + 27 =
  6. 6.161 + 69 =
  7. 7.294 + 57 =
  8. 8.116 + 87 =
  9. 9.382 + 88 =
  10. 10.257 + 69 =
  11. 11.89 + 49 =
  12. 12.490 + 27 =
  13. 13.366 + 77 =
  14. 14.250 + 98 =
  15. 15.28 + 37 =
  16. 16.428 + 29 =
  17. 17.260 + 78 =
  18. 18.94 + 37 =
  19. 19.67 + 57 =
  20. 20.466 + 18 =
  21. 21.300 + 27 =
  22. 22.259 + 18 =
  23. 23.82 + 89 =
  24. 24.134 + 17 =
  25. 25.120 + 29 =
  26. 26.42 + 48 =
  27. 27.61 + 19 =
  28. 28.446 + 19 =
  29. 29.343 + 59 =
  30. 30.267 + 88 =
  31. 31.156 + 99 =
  32. 32.435 + 17 =
  33. 33.64 + 69 =
  34. 34.187 + 88 =
  35. 35.443 + 47 =
  36. 36.235 + 77 =
  37. 37.485 + 79 =
  38. 38.431 + 39 =
  39. 39.50 + 17 =
  40. 40.71 + 87 =

Answer key

  1. 491
  2. 316
  3. 213
  4. 304
  5. 399
  6. 230
  7. 351
  8. 203
  9. 470
  10. 326
  11. 138
  12. 517
  13. 443
  14. 348
  15. 65
  16. 457
  17. 338
  18. 131
  19. 124
  20. 484
  21. 327
  22. 277
  23. 171
  24. 151
  25. 149
  26. 90
  27. 80
  28. 465
  29. 402
  30. 355
  31. 255
  32. 452
  33. 133
  34. 275
  35. 490
  36. 312
  37. 564
  38. 470
  39. 67
  40. 158

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