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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 232 · 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. 1.374 + 18 =
  2. 2.434 + 47 =
  3. 3.388 + 67 =
  4. 4.104 + 37 =
  5. 5.418 + 19 =
  6. 6.262 + 77 =
  7. 7.416 + 47 =
  8. 8.320 + 77 =
  9. 9.144 + 49 =
  10. 10.363 + 29 =
  11. 11.427 + 78 =
  12. 12.171 + 99 =
  13. 13.244 + 19 =
  14. 14.26 + 27 =
  15. 15.210 + 99 =
  16. 16.225 + 79 =
  17. 17.161 + 69 =
  18. 18.291 + 47 =
  19. 19.160 + 87 =
  20. 20.29 + 47 =
  21. 21.124 + 58 =
  22. 22.289 + 48 =
  23. 23.308 + 27 =
  24. 24.176 + 88 =
  25. 25.347 + 29 =
  26. 26.464 + 29 =
  27. 27.79 + 27 =
  28. 28.217 + 39 =
  29. 29.156 + 18 =
  30. 30.189 + 67 =
  31. 31.415 + 57 =
  32. 32.301 + 48 =
  33. 33.49 + 97 =
  34. 34.41 + 99 =
  35. 35.200 + 78 =
  36. 36.389 + 18 =
  37. 37.61 + 29 =
  38. 38.260 + 27 =
  39. 39.475 + 69 =
  40. 40.215 + 27 =

Answer key

  1. 392
  2. 481
  3. 455
  4. 141
  5. 437
  6. 339
  7. 463
  8. 397
  9. 193
  10. 392
  11. 505
  12. 270
  13. 263
  14. 53
  15. 309
  16. 304
  17. 230
  18. 338
  19. 247
  20. 76
  21. 182
  22. 337
  23. 335
  24. 264
  25. 376
  26. 493
  27. 106
  28. 256
  29. 174
  30. 256
  31. 472
  32. 349
  33. 146
  34. 140
  35. 278
  36. 407
  37. 90
  38. 287
  39. 544
  40. 242

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