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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 531 · 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. 1.410 + 77 =
  2. 2.375 + 47 =
  3. 3.486 + 77 =
  4. 4.334 + 89 =
  5. 5.123 + 68 =
  6. 6.455 + 27 =
  7. 7.416 + 57 =
  8. 8.276 + 18 =
  9. 9.339 + 47 =
  10. 10.260 + 89 =
  11. 11.113 + 18 =
  12. 12.53 + 19 =
  13. 13.135 + 47 =
  14. 14.351 + 97 =
  15. 15.273 + 68 =
  16. 16.408 + 37 =
  17. 17.205 + 57 =
  18. 18.296 + 78 =
  19. 19.447 + 38 =
  20. 20.496 + 59 =
  21. 21.308 + 48 =
  22. 22.402 + 49 =
  23. 23.149 + 77 =
  24. 24.356 + 48 =
  25. 25.411 + 27 =
  26. 26.154 + 28 =
  27. 27.469 + 67 =
  28. 28.467 + 89 =
  29. 29.134 + 89 =
  30. 30.214 + 28 =
  31. 31.79 + 28 =
  32. 32.150 + 89 =
  33. 33.84 + 99 =
  34. 34.281 + 17 =
  35. 35.351 + 78 =
  36. 36.27 + 19 =
  37. 37.80 + 37 =
  38. 38.389 + 58 =
  39. 39.449 + 18 =
  40. 40.391 + 78 =

Answer key

  1. 487
  2. 422
  3. 563
  4. 423
  5. 191
  6. 482
  7. 473
  8. 294
  9. 386
  10. 349
  11. 131
  12. 72
  13. 182
  14. 448
  15. 341
  16. 445
  17. 262
  18. 374
  19. 485
  20. 555
  21. 356
  22. 451
  23. 226
  24. 404
  25. 438
  26. 182
  27. 536
  28. 556
  29. 223
  30. 242
  31. 107
  32. 239
  33. 183
  34. 298
  35. 429
  36. 46
  37. 117
  38. 447
  39. 467
  40. 469

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