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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 346 · 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. 1.148 + 19 =
  2. 2.107 + 47 =
  3. 3.434 + 39 =
  4. 4.35 + 97 =
  5. 5.485 + 18 =
  6. 6.381 + 47 =
  7. 7.367 + 48 =
  8. 8.85 + 57 =
  9. 9.135 + 59 =
  10. 10.265 + 67 =
  11. 11.468 + 17 =
  12. 12.32 + 97 =
  13. 13.499 + 18 =
  14. 14.134 + 87 =
  15. 15.115 + 38 =
  16. 16.369 + 49 =
  17. 17.378 + 47 =
  18. 18.29 + 57 =
  19. 19.333 + 98 =
  20. 20.342 + 18 =
  21. 21.376 + 47 =
  22. 22.75 + 47 =
  23. 23.187 + 97 =
  24. 24.304 + 47 =
  25. 25.471 + 29 =
  26. 26.330 + 27 =
  27. 27.332 + 88 =
  28. 28.70 + 38 =
  29. 29.253 + 17 =
  30. 30.154 + 28 =
  31. 31.322 + 49 =
  32. 32.171 + 38 =
  33. 33.339 + 37 =
  34. 34.93 + 58 =
  35. 35.395 + 98 =
  36. 36.156 + 57 =
  37. 37.76 + 68 =
  38. 38.260 + 49 =
  39. 39.330 + 88 =
  40. 40.289 + 67 =

Answer key

  1. 167
  2. 154
  3. 473
  4. 132
  5. 503
  6. 428
  7. 415
  8. 142
  9. 194
  10. 332
  11. 485
  12. 129
  13. 517
  14. 221
  15. 153
  16. 418
  17. 425
  18. 86
  19. 431
  20. 360
  21. 423
  22. 122
  23. 284
  24. 351
  25. 500
  26. 357
  27. 420
  28. 108
  29. 270
  30. 182
  31. 371
  32. 209
  33. 376
  34. 151
  35. 493
  36. 213
  37. 144
  38. 309
  39. 418
  40. 356

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