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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 607 · 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. 1.221 + 57 =
  2. 2.96 + 97 =
  3. 3.404 + 59 =
  4. 4.495 + 29 =
  5. 5.142 + 38 =
  6. 6.375 + 37 =
  7. 7.146 + 68 =
  8. 8.68 + 37 =
  9. 9.84 + 89 =
  10. 10.405 + 79 =
  11. 11.96 + 59 =
  12. 12.376 + 17 =
  13. 13.448 + 78 =
  14. 14.331 + 18 =
  15. 15.320 + 87 =
  16. 16.293 + 79 =
  17. 17.456 + 48 =
  18. 18.83 + 27 =
  19. 19.89 + 88 =
  20. 20.275 + 77 =
  21. 21.264 + 39 =
  22. 22.425 + 29 =
  23. 23.84 + 19 =
  24. 24.364 + 18 =
  25. 25.336 + 57 =
  26. 26.114 + 79 =
  27. 27.484 + 67 =
  28. 28.213 + 77 =
  29. 29.398 + 59 =
  30. 30.479 + 77 =
  31. 31.47 + 27 =
  32. 32.399 + 57 =
  33. 33.129 + 38 =
  34. 34.280 + 28 =
  35. 35.215 + 88 =
  36. 36.302 + 87 =
  37. 37.379 + 38 =
  38. 38.325 + 59 =
  39. 39.348 + 47 =
  40. 40.226 + 68 =

Answer key

  1. 278
  2. 193
  3. 463
  4. 524
  5. 180
  6. 412
  7. 214
  8. 105
  9. 173
  10. 484
  11. 155
  12. 393
  13. 526
  14. 349
  15. 407
  16. 372
  17. 504
  18. 110
  19. 177
  20. 352
  21. 303
  22. 454
  23. 103
  24. 382
  25. 393
  26. 193
  27. 551
  28. 290
  29. 457
  30. 556
  31. 74
  32. 456
  33. 167
  34. 308
  35. 303
  36. 389
  37. 417
  38. 384
  39. 395
  40. 294

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