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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 785 · 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. 1.296 + 17 =
  2. 2.99 + 87 =
  3. 3.211 + 98 =
  4. 4.476 + 17 =
  5. 5.367 + 99 =
  6. 6.203 + 37 =
  7. 7.346 + 87 =
  8. 8.179 + 58 =
  9. 9.66 + 27 =
  10. 10.263 + 69 =
  11. 11.339 + 77 =
  12. 12.273 + 37 =
  13. 13.68 + 98 =
  14. 14.83 + 37 =
  15. 15.107 + 48 =
  16. 16.489 + 28 =
  17. 17.74 + 87 =
  18. 18.336 + 77 =
  19. 19.39 + 87 =
  20. 20.430 + 37 =
  21. 21.225 + 58 =
  22. 22.237 + 57 =
  23. 23.468 + 29 =
  24. 24.359 + 68 =
  25. 25.340 + 39 =
  26. 26.262 + 27 =
  27. 27.295 + 27 =
  28. 28.388 + 98 =
  29. 29.120 + 59 =
  30. 30.440 + 18 =
  31. 31.419 + 17 =
  32. 32.161 + 28 =
  33. 33.489 + 89 =
  34. 34.252 + 87 =
  35. 35.26 + 48 =
  36. 36.311 + 57 =
  37. 37.150 + 87 =
  38. 38.293 + 17 =
  39. 39.242 + 37 =
  40. 40.99 + 87 =

Answer key

  1. 313
  2. 186
  3. 309
  4. 493
  5. 466
  6. 240
  7. 433
  8. 237
  9. 93
  10. 332
  11. 416
  12. 310
  13. 166
  14. 120
  15. 155
  16. 517
  17. 161
  18. 413
  19. 126
  20. 467
  21. 283
  22. 294
  23. 497
  24. 427
  25. 379
  26. 289
  27. 322
  28. 486
  29. 179
  30. 458
  31. 436
  32. 189
  33. 578
  34. 339
  35. 74
  36. 368
  37. 237
  38. 310
  39. 279
  40. 186

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