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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 318 · 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. 1.474 + 77 =
  2. 2.386 + 89 =
  3. 3.31 + 88 =
  4. 4.27 + 87 =
  5. 5.284 + 27 =
  6. 6.411 + 38 =
  7. 7.444 + 87 =
  8. 8.173 + 28 =
  9. 9.311 + 59 =
  10. 10.254 + 49 =
  11. 11.104 + 49 =
  12. 12.234 + 37 =
  13. 13.173 + 68 =
  14. 14.269 + 59 =
  15. 15.375 + 68 =
  16. 16.118 + 99 =
  17. 17.70 + 59 =
  18. 18.39 + 17 =
  19. 19.485 + 67 =
  20. 20.133 + 78 =
  21. 21.55 + 27 =
  22. 22.430 + 58 =
  23. 23.114 + 47 =
  24. 24.203 + 19 =
  25. 25.398 + 17 =
  26. 26.265 + 47 =
  27. 27.436 + 77 =
  28. 28.163 + 79 =
  29. 29.184 + 18 =
  30. 30.491 + 28 =
  31. 31.387 + 38 =
  32. 32.100 + 49 =
  33. 33.478 + 27 =
  34. 34.192 + 27 =
  35. 35.170 + 29 =
  36. 36.496 + 59 =
  37. 37.433 + 97 =
  38. 38.131 + 59 =
  39. 39.281 + 68 =
  40. 40.293 + 49 =

Answer key

  1. 551
  2. 475
  3. 119
  4. 114
  5. 311
  6. 449
  7. 531
  8. 201
  9. 370
  10. 303
  11. 153
  12. 271
  13. 241
  14. 328
  15. 443
  16. 217
  17. 129
  18. 56
  19. 552
  20. 211
  21. 82
  22. 488
  23. 161
  24. 222
  25. 415
  26. 312
  27. 513
  28. 242
  29. 202
  30. 519
  31. 425
  32. 149
  33. 505
  34. 219
  35. 199
  36. 555
  37. 530
  38. 190
  39. 349
  40. 342

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