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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 656 · 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. 1.40 + 67 =
  2. 2.466 + 98 =
  3. 3.408 + 18 =
  4. 4.176 + 47 =
  5. 5.119 + 48 =
  6. 6.146 + 39 =
  7. 7.220 + 97 =
  8. 8.483 + 17 =
  9. 9.146 + 67 =
  10. 10.33 + 69 =
  11. 11.341 + 27 =
  12. 12.124 + 28 =
  13. 13.307 + 69 =
  14. 14.297 + 17 =
  15. 15.128 + 37 =
  16. 16.44 + 79 =
  17. 17.323 + 38 =
  18. 18.222 + 89 =
  19. 19.241 + 19 =
  20. 20.362 + 38 =
  21. 21.338 + 77 =
  22. 22.276 + 57 =
  23. 23.238 + 89 =
  24. 24.320 + 97 =
  25. 25.27 + 57 =
  26. 26.121 + 97 =
  27. 27.179 + 19 =
  28. 28.56 + 38 =
  29. 29.155 + 18 =
  30. 30.472 + 99 =
  31. 31.463 + 18 =
  32. 32.28 + 37 =
  33. 33.387 + 58 =
  34. 34.66 + 89 =
  35. 35.399 + 97 =
  36. 36.370 + 69 =
  37. 37.163 + 99 =
  38. 38.332 + 97 =
  39. 39.280 + 49 =
  40. 40.298 + 67 =

Answer key

  1. 107
  2. 564
  3. 426
  4. 223
  5. 167
  6. 185
  7. 317
  8. 500
  9. 213
  10. 102
  11. 368
  12. 152
  13. 376
  14. 314
  15. 165
  16. 123
  17. 361
  18. 311
  19. 260
  20. 400
  21. 415
  22. 333
  23. 327
  24. 417
  25. 84
  26. 218
  27. 198
  28. 94
  29. 173
  30. 571
  31. 481
  32. 65
  33. 445
  34. 155
  35. 496
  36. 439
  37. 262
  38. 429
  39. 329
  40. 365

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