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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 35 · 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. 1.151 + 78 =
  2. 2.157 + 28 =
  3. 3.365 + 49 =
  4. 4.224 + 87 =
  5. 5.470 + 19 =
  6. 6.163 + 37 =
  7. 7.479 + 79 =
  8. 8.282 + 69 =
  9. 9.274 + 77 =
  10. 10.262 + 68 =
  11. 11.490 + 98 =
  12. 12.300 + 68 =
  13. 13.433 + 89 =
  14. 14.227 + 67 =
  15. 15.339 + 18 =
  16. 16.66 + 37 =
  17. 17.366 + 89 =
  18. 18.256 + 28 =
  19. 19.114 + 88 =
  20. 20.323 + 57 =
  21. 21.159 + 19 =
  22. 22.93 + 97 =
  23. 23.294 + 79 =
  24. 24.324 + 98 =
  25. 25.309 + 18 =
  26. 26.486 + 88 =
  27. 27.331 + 57 =
  28. 28.195 + 27 =
  29. 29.328 + 17 =
  30. 30.368 + 28 =
  31. 31.213 + 67 =
  32. 32.477 + 59 =
  33. 33.144 + 87 =
  34. 34.349 + 57 =
  35. 35.233 + 58 =
  36. 36.454 + 17 =
  37. 37.32 + 47 =
  38. 38.178 + 19 =
  39. 39.380 + 59 =
  40. 40.107 + 58 =

Answer key

  1. 229
  2. 185
  3. 414
  4. 311
  5. 489
  6. 200
  7. 558
  8. 351
  9. 351
  10. 330
  11. 588
  12. 368
  13. 522
  14. 294
  15. 357
  16. 103
  17. 455
  18. 284
  19. 202
  20. 380
  21. 178
  22. 190
  23. 373
  24. 422
  25. 327
  26. 574
  27. 388
  28. 222
  29. 345
  30. 396
  31. 280
  32. 536
  33. 231
  34. 406
  35. 291
  36. 471
  37. 79
  38. 197
  39. 439
  40. 165

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