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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 216 · 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. 1.46 + 59 =
  2. 2.318 + 27 =
  3. 3.66 + 88 =
  4. 4.434 + 39 =
  5. 5.102 + 68 =
  6. 6.49 + 39 =
  7. 7.286 + 38 =
  8. 8.262 + 39 =
  9. 9.341 + 27 =
  10. 10.289 + 29 =
  11. 11.459 + 27 =
  12. 12.83 + 57 =
  13. 13.100 + 59 =
  14. 14.363 + 69 =
  15. 15.374 + 67 =
  16. 16.437 + 58 =
  17. 17.190 + 88 =
  18. 18.341 + 97 =
  19. 19.139 + 67 =
  20. 20.490 + 87 =
  21. 21.276 + 39 =
  22. 22.453 + 87 =
  23. 23.110 + 69 =
  24. 24.435 + 37 =
  25. 25.416 + 17 =
  26. 26.138 + 38 =
  27. 27.365 + 47 =
  28. 28.116 + 27 =
  29. 29.234 + 38 =
  30. 30.80 + 59 =
  31. 31.305 + 78 =
  32. 32.377 + 97 =
  33. 33.143 + 18 =
  34. 34.408 + 28 =
  35. 35.438 + 67 =
  36. 36.290 + 87 =
  37. 37.239 + 97 =
  38. 38.328 + 67 =
  39. 39.325 + 69 =
  40. 40.221 + 58 =

Answer key

  1. 105
  2. 345
  3. 154
  4. 473
  5. 170
  6. 88
  7. 324
  8. 301
  9. 368
  10. 318
  11. 486
  12. 140
  13. 159
  14. 432
  15. 441
  16. 495
  17. 278
  18. 438
  19. 206
  20. 577
  21. 315
  22. 540
  23. 179
  24. 472
  25. 433
  26. 176
  27. 412
  28. 143
  29. 272
  30. 139
  31. 383
  32. 474
  33. 161
  34. 436
  35. 505
  36. 377
  37. 336
  38. 395
  39. 394
  40. 279

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