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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 471 · 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. 1.208 + 48 =
  2. 2.354 + 57 =
  3. 3.470 + 67 =
  4. 4.342 + 49 =
  5. 5.464 + 19 =
  6. 6.374 + 27 =
  7. 7.53 + 27 =
  8. 8.102 + 37 =
  9. 9.471 + 87 =
  10. 10.186 + 97 =
  11. 11.242 + 38 =
  12. 12.152 + 29 =
  13. 13.25 + 29 =
  14. 14.345 + 29 =
  15. 15.200 + 37 =
  16. 16.218 + 38 =
  17. 17.260 + 78 =
  18. 18.71 + 58 =
  19. 19.229 + 98 =
  20. 20.152 + 77 =
  21. 21.253 + 99 =
  22. 22.40 + 19 =
  23. 23.293 + 69 =
  24. 24.459 + 38 =
  25. 25.36 + 58 =
  26. 26.272 + 57 =
  27. 27.237 + 97 =
  28. 28.192 + 57 =
  29. 29.151 + 57 =
  30. 30.389 + 18 =
  31. 31.264 + 29 =
  32. 32.204 + 67 =
  33. 33.228 + 57 =
  34. 34.373 + 98 =
  35. 35.83 + 37 =
  36. 36.127 + 88 =
  37. 37.420 + 79 =
  38. 38.332 + 79 =
  39. 39.369 + 49 =
  40. 40.477 + 58 =

Answer key

  1. 256
  2. 411
  3. 537
  4. 391
  5. 483
  6. 401
  7. 80
  8. 139
  9. 558
  10. 283
  11. 280
  12. 181
  13. 54
  14. 374
  15. 237
  16. 256
  17. 338
  18. 129
  19. 327
  20. 229
  21. 352
  22. 59
  23. 362
  24. 497
  25. 94
  26. 329
  27. 334
  28. 249
  29. 208
  30. 407
  31. 293
  32. 271
  33. 285
  34. 471
  35. 120
  36. 215
  37. 499
  38. 411
  39. 418
  40. 535

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