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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 328 · 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. 1.36 + 78 =
  2. 2.161 + 69 =
  3. 3.491 + 39 =
  4. 4.309 + 78 =
  5. 5.435 + 17 =
  6. 6.91 + 78 =
  7. 7.139 + 67 =
  8. 8.331 + 69 =
  9. 9.295 + 89 =
  10. 10.33 + 79 =
  11. 11.269 + 29 =
  12. 12.44 + 17 =
  13. 13.305 + 67 =
  14. 14.157 + 29 =
  15. 15.309 + 19 =
  16. 16.359 + 17 =
  17. 17.337 + 97 =
  18. 18.28 + 19 =
  19. 19.254 + 48 =
  20. 20.144 + 99 =
  21. 21.492 + 69 =
  22. 22.158 + 19 =
  23. 23.236 + 39 =
  24. 24.467 + 59 =
  25. 25.399 + 37 =
  26. 26.391 + 68 =
  27. 27.404 + 89 =
  28. 28.114 + 17 =
  29. 29.454 + 88 =
  30. 30.118 + 59 =
  31. 31.259 + 57 =
  32. 32.447 + 77 =
  33. 33.106 + 78 =
  34. 34.88 + 47 =
  35. 35.373 + 18 =
  36. 36.454 + 38 =
  37. 37.39 + 17 =
  38. 38.339 + 57 =
  39. 39.368 + 37 =
  40. 40.37 + 48 =

Answer key

  1. 114
  2. 230
  3. 530
  4. 387
  5. 452
  6. 169
  7. 206
  8. 400
  9. 384
  10. 112
  11. 298
  12. 61
  13. 372
  14. 186
  15. 328
  16. 376
  17. 434
  18. 47
  19. 302
  20. 243
  21. 561
  22. 177
  23. 275
  24. 526
  25. 436
  26. 459
  27. 493
  28. 131
  29. 542
  30. 177
  31. 316
  32. 524
  33. 184
  34. 135
  35. 391
  36. 492
  37. 56
  38. 396
  39. 405
  40. 85

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