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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 233 · 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. 1.366 + 28 =
  2. 2.395 + 39 =
  3. 3.472 + 98 =
  4. 4.363 + 79 =
  5. 5.64 + 58 =
  6. 6.82 + 57 =
  7. 7.293 + 27 =
  8. 8.355 + 88 =
  9. 9.464 + 97 =
  10. 10.482 + 48 =
  11. 11.444 + 28 =
  12. 12.311 + 68 =
  13. 13.366 + 19 =
  14. 14.54 + 28 =
  15. 15.26 + 77 =
  16. 16.41 + 37 =
  17. 17.235 + 69 =
  18. 18.79 + 69 =
  19. 19.196 + 69 =
  20. 20.86 + 89 =
  21. 21.218 + 69 =
  22. 22.77 + 39 =
  23. 23.393 + 67 =
  24. 24.203 + 87 =
  25. 25.466 + 59 =
  26. 26.115 + 97 =
  27. 27.125 + 29 =
  28. 28.442 + 48 =
  29. 29.384 + 27 =
  30. 30.440 + 28 =
  31. 31.414 + 67 =
  32. 32.336 + 57 =
  33. 33.36 + 29 =
  34. 34.139 + 48 =
  35. 35.159 + 77 =
  36. 36.433 + 27 =
  37. 37.46 + 29 =
  38. 38.205 + 59 =
  39. 39.472 + 49 =
  40. 40.327 + 17 =

Answer key

  1. 394
  2. 434
  3. 570
  4. 442
  5. 122
  6. 139
  7. 320
  8. 443
  9. 561
  10. 530
  11. 472
  12. 379
  13. 385
  14. 82
  15. 103
  16. 78
  17. 304
  18. 148
  19. 265
  20. 175
  21. 287
  22. 116
  23. 460
  24. 290
  25. 525
  26. 212
  27. 154
  28. 490
  29. 411
  30. 468
  31. 481
  32. 393
  33. 65
  34. 187
  35. 236
  36. 460
  37. 75
  38. 264
  39. 521
  40. 344

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