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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 377 · 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. 1.451 + 87 =
  2. 2.56 + 88 =
  3. 3.57 + 69 =
  4. 4.444 + 88 =
  5. 5.189 + 98 =
  6. 6.99 + 89 =
  7. 7.319 + 97 =
  8. 8.70 + 39 =
  9. 9.34 + 27 =
  10. 10.440 + 27 =
  11. 11.171 + 69 =
  12. 12.322 + 97 =
  13. 13.333 + 99 =
  14. 14.415 + 77 =
  15. 15.254 + 59 =
  16. 16.362 + 59 =
  17. 17.105 + 49 =
  18. 18.30 + 39 =
  19. 19.212 + 59 =
  20. 20.51 + 68 =
  21. 21.359 + 89 =
  22. 22.66 + 57 =
  23. 23.129 + 77 =
  24. 24.182 + 48 =
  25. 25.363 + 79 =
  26. 26.309 + 69 =
  27. 27.250 + 28 =
  28. 28.120 + 37 =
  29. 29.318 + 58 =
  30. 30.387 + 28 =
  31. 31.278 + 77 =
  32. 32.214 + 97 =
  33. 33.477 + 69 =
  34. 34.90 + 78 =
  35. 35.245 + 28 =
  36. 36.225 + 89 =
  37. 37.138 + 87 =
  38. 38.95 + 87 =
  39. 39.75 + 68 =
  40. 40.163 + 98 =

Answer key

  1. 538
  2. 144
  3. 126
  4. 532
  5. 287
  6. 188
  7. 416
  8. 109
  9. 61
  10. 467
  11. 240
  12. 419
  13. 432
  14. 492
  15. 313
  16. 421
  17. 154
  18. 69
  19. 271
  20. 119
  21. 448
  22. 123
  23. 206
  24. 230
  25. 442
  26. 378
  27. 278
  28. 157
  29. 376
  30. 415
  31. 355
  32. 311
  33. 546
  34. 168
  35. 273
  36. 314
  37. 225
  38. 182
  39. 143
  40. 261

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