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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 155 · 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. 1.379 + 77 =
  2. 2.31 + 48 =
  3. 3.262 + 29 =
  4. 4.235 + 69 =
  5. 5.31 + 57 =
  6. 6.297 + 29 =
  7. 7.432 + 19 =
  8. 8.219 + 39 =
  9. 9.330 + 28 =
  10. 10.285 + 48 =
  11. 11.127 + 87 =
  12. 12.92 + 59 =
  13. 13.137 + 18 =
  14. 14.465 + 37 =
  15. 15.498 + 68 =
  16. 16.495 + 28 =
  17. 17.425 + 49 =
  18. 18.157 + 48 =
  19. 19.332 + 18 =
  20. 20.334 + 29 =
  21. 21.50 + 17 =
  22. 22.475 + 57 =
  23. 23.358 + 69 =
  24. 24.71 + 68 =
  25. 25.359 + 17 =
  26. 26.308 + 39 =
  27. 27.291 + 57 =
  28. 28.398 + 17 =
  29. 29.306 + 89 =
  30. 30.447 + 49 =
  31. 31.204 + 48 =
  32. 32.74 + 27 =
  33. 33.288 + 89 =
  34. 34.388 + 78 =
  35. 35.111 + 18 =
  36. 36.171 + 89 =
  37. 37.336 + 79 =
  38. 38.499 + 68 =
  39. 39.229 + 67 =
  40. 40.293 + 29 =

Answer key

  1. 456
  2. 79
  3. 291
  4. 304
  5. 88
  6. 326
  7. 451
  8. 258
  9. 358
  10. 333
  11. 214
  12. 151
  13. 155
  14. 502
  15. 566
  16. 523
  17. 474
  18. 205
  19. 350
  20. 363
  21. 67
  22. 532
  23. 427
  24. 139
  25. 376
  26. 347
  27. 348
  28. 415
  29. 395
  30. 496
  31. 252
  32. 101
  33. 377
  34. 466
  35. 129
  36. 260
  37. 415
  38. 567
  39. 296
  40. 322

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