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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 569 · 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. 1.241 + 27 =
  2. 2.409 + 59 =
  3. 3.251 + 79 =
  4. 4.202 + 39 =
  5. 5.299 + 19 =
  6. 6.32 + 87 =
  7. 7.108 + 37 =
  8. 8.444 + 17 =
  9. 9.377 + 29 =
  10. 10.325 + 78 =
  11. 11.444 + 47 =
  12. 12.466 + 27 =
  13. 13.353 + 38 =
  14. 14.472 + 39 =
  15. 15.220 + 99 =
  16. 16.156 + 47 =
  17. 17.141 + 88 =
  18. 18.429 + 68 =
  19. 19.266 + 49 =
  20. 20.218 + 89 =
  21. 21.147 + 57 =
  22. 22.144 + 47 =
  23. 23.167 + 37 =
  24. 24.282 + 67 =
  25. 25.344 + 57 =
  26. 26.485 + 47 =
  27. 27.420 + 78 =
  28. 28.351 + 47 =
  29. 29.52 + 38 =
  30. 30.443 + 87 =
  31. 31.285 + 18 =
  32. 32.108 + 58 =
  33. 33.367 + 77 =
  34. 34.474 + 47 =
  35. 35.144 + 67 =
  36. 36.148 + 57 =
  37. 37.123 + 59 =
  38. 38.442 + 59 =
  39. 39.125 + 39 =
  40. 40.43 + 67 =

Answer key

  1. 268
  2. 468
  3. 330
  4. 241
  5. 318
  6. 119
  7. 145
  8. 461
  9. 406
  10. 403
  11. 491
  12. 493
  13. 391
  14. 511
  15. 319
  16. 203
  17. 229
  18. 497
  19. 315
  20. 307
  21. 204
  22. 191
  23. 204
  24. 349
  25. 401
  26. 532
  27. 498
  28. 398
  29. 90
  30. 530
  31. 303
  32. 166
  33. 444
  34. 521
  35. 211
  36. 205
  37. 182
  38. 501
  39. 164
  40. 110

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