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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 558 · 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. 1.117 + 89 =
  2. 2.66 + 98 =
  3. 3.474 + 57 =
  4. 4.307 + 78 =
  5. 5.387 + 19 =
  6. 6.317 + 88 =
  7. 7.221 + 87 =
  8. 8.93 + 69 =
  9. 9.467 + 97 =
  10. 10.296 + 48 =
  11. 11.434 + 57 =
  12. 12.485 + 18 =
  13. 13.306 + 17 =
  14. 14.161 + 77 =
  15. 15.132 + 87 =
  16. 16.286 + 27 =
  17. 17.133 + 97 =
  18. 18.217 + 38 =
  19. 19.88 + 29 =
  20. 20.355 + 29 =
  21. 21.264 + 39 =
  22. 22.72 + 59 =
  23. 23.192 + 47 =
  24. 24.291 + 87 =
  25. 25.306 + 98 =
  26. 26.148 + 39 =
  27. 27.224 + 37 =
  28. 28.104 + 79 =
  29. 29.272 + 17 =
  30. 30.302 + 37 =
  31. 31.159 + 47 =
  32. 32.129 + 19 =
  33. 33.200 + 78 =
  34. 34.99 + 47 =
  35. 35.467 + 48 =
  36. 36.93 + 98 =
  37. 37.403 + 17 =
  38. 38.361 + 97 =
  39. 39.88 + 57 =
  40. 40.393 + 98 =

Answer key

  1. 206
  2. 164
  3. 531
  4. 385
  5. 406
  6. 405
  7. 308
  8. 162
  9. 564
  10. 344
  11. 491
  12. 503
  13. 323
  14. 238
  15. 219
  16. 313
  17. 230
  18. 255
  19. 117
  20. 384
  21. 303
  22. 131
  23. 239
  24. 378
  25. 404
  26. 187
  27. 261
  28. 183
  29. 289
  30. 339
  31. 206
  32. 148
  33. 278
  34. 146
  35. 515
  36. 191
  37. 420
  38. 458
  39. 145
  40. 491

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