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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 662 · 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. 1.195 + 97 =
  2. 2.273 + 87 =
  3. 3.229 + 97 =
  4. 4.203 + 39 =
  5. 5.159 + 39 =
  6. 6.60 + 17 =
  7. 7.160 + 37 =
  8. 8.472 + 89 =
  9. 9.93 + 39 =
  10. 10.377 + 87 =
  11. 11.50 + 28 =
  12. 12.496 + 58 =
  13. 13.476 + 39 =
  14. 14.294 + 57 =
  15. 15.158 + 19 =
  16. 16.266 + 57 =
  17. 17.189 + 27 =
  18. 18.294 + 49 =
  19. 19.280 + 49 =
  20. 20.89 + 88 =
  21. 21.49 + 19 =
  22. 22.40 + 17 =
  23. 23.115 + 58 =
  24. 24.449 + 39 =
  25. 25.468 + 19 =
  26. 26.221 + 58 =
  27. 27.349 + 27 =
  28. 28.455 + 39 =
  29. 29.260 + 69 =
  30. 30.274 + 29 =
  31. 31.427 + 27 =
  32. 32.275 + 58 =
  33. 33.215 + 28 =
  34. 34.399 + 37 =
  35. 35.489 + 27 =
  36. 36.498 + 17 =
  37. 37.477 + 18 =
  38. 38.431 + 87 =
  39. 39.307 + 38 =
  40. 40.383 + 79 =

Answer key

  1. 292
  2. 360
  3. 326
  4. 242
  5. 198
  6. 77
  7. 197
  8. 561
  9. 132
  10. 464
  11. 78
  12. 554
  13. 515
  14. 351
  15. 177
  16. 323
  17. 216
  18. 343
  19. 329
  20. 177
  21. 68
  22. 57
  23. 173
  24. 488
  25. 487
  26. 279
  27. 376
  28. 494
  29. 329
  30. 303
  31. 454
  32. 333
  33. 243
  34. 436
  35. 516
  36. 515
  37. 495
  38. 518
  39. 345
  40. 462

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