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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 703 · 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. 1.130 + 37 =
  2. 2.226 + 19 =
  3. 3.255 + 79 =
  4. 4.471 + 19 =
  5. 5.486 + 77 =
  6. 6.416 + 17 =
  7. 7.287 + 87 =
  8. 8.278 + 67 =
  9. 9.330 + 78 =
  10. 10.411 + 28 =
  11. 11.176 + 68 =
  12. 12.442 + 88 =
  13. 13.263 + 47 =
  14. 14.173 + 98 =
  15. 15.157 + 19 =
  16. 16.325 + 59 =
  17. 17.466 + 69 =
  18. 18.495 + 39 =
  19. 19.162 + 89 =
  20. 20.276 + 48 =
  21. 21.41 + 19 =
  22. 22.448 + 69 =
  23. 23.269 + 68 =
  24. 24.177 + 99 =
  25. 25.161 + 97 =
  26. 26.482 + 58 =
  27. 27.347 + 19 =
  28. 28.334 + 88 =
  29. 29.196 + 39 =
  30. 30.315 + 37 =
  31. 31.204 + 87 =
  32. 32.490 + 97 =
  33. 33.336 + 98 =
  34. 34.159 + 27 =
  35. 35.226 + 99 =
  36. 36.70 + 19 =
  37. 37.127 + 68 =
  38. 38.205 + 67 =
  39. 39.488 + 17 =
  40. 40.376 + 68 =

Answer key

  1. 167
  2. 245
  3. 334
  4. 490
  5. 563
  6. 433
  7. 374
  8. 345
  9. 408
  10. 439
  11. 244
  12. 530
  13. 310
  14. 271
  15. 176
  16. 384
  17. 535
  18. 534
  19. 251
  20. 324
  21. 60
  22. 517
  23. 337
  24. 276
  25. 258
  26. 540
  27. 366
  28. 422
  29. 235
  30. 352
  31. 291
  32. 587
  33. 434
  34. 186
  35. 325
  36. 89
  37. 195
  38. 272
  39. 505
  40. 444

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