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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 337 · 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. 1.469 + 29 =
  2. 2.100 + 79 =
  3. 3.56 + 17 =
  4. 4.289 + 17 =
  5. 5.329 + 58 =
  6. 6.219 + 17 =
  7. 7.314 + 97 =
  8. 8.438 + 49 =
  9. 9.172 + 37 =
  10. 10.303 + 57 =
  11. 11.357 + 98 =
  12. 12.499 + 69 =
  13. 13.485 + 77 =
  14. 14.159 + 57 =
  15. 15.170 + 97 =
  16. 16.243 + 19 =
  17. 17.41 + 18 =
  18. 18.317 + 89 =
  19. 19.56 + 89 =
  20. 20.28 + 89 =
  21. 21.326 + 89 =
  22. 22.279 + 77 =
  23. 23.168 + 79 =
  24. 24.275 + 17 =
  25. 25.410 + 77 =
  26. 26.323 + 67 =
  27. 27.371 + 39 =
  28. 28.179 + 57 =
  29. 29.348 + 17 =
  30. 30.130 + 69 =
  31. 31.261 + 67 =
  32. 32.122 + 99 =
  33. 33.359 + 38 =
  34. 34.269 + 19 =
  35. 35.207 + 18 =
  36. 36.41 + 19 =
  37. 37.28 + 89 =
  38. 38.477 + 38 =
  39. 39.238 + 37 =
  40. 40.338 + 68 =

Answer key

  1. 498
  2. 179
  3. 73
  4. 306
  5. 387
  6. 236
  7. 411
  8. 487
  9. 209
  10. 360
  11. 455
  12. 568
  13. 562
  14. 216
  15. 267
  16. 262
  17. 59
  18. 406
  19. 145
  20. 117
  21. 415
  22. 356
  23. 247
  24. 292
  25. 487
  26. 390
  27. 410
  28. 236
  29. 365
  30. 199
  31. 328
  32. 221
  33. 397
  34. 288
  35. 225
  36. 60
  37. 117
  38. 515
  39. 275
  40. 406

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