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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 813 · 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. 1.480 + 98 =
  2. 2.233 + 87 =
  3. 3.333 + 48 =
  4. 4.25 + 77 =
  5. 5.289 + 98 =
  6. 6.350 + 17 =
  7. 7.37 + 98 =
  8. 8.410 + 79 =
  9. 9.83 + 99 =
  10. 10.358 + 27 =
  11. 11.90 + 37 =
  12. 12.359 + 38 =
  13. 13.244 + 87 =
  14. 14.115 + 17 =
  15. 15.493 + 29 =
  16. 16.30 + 47 =
  17. 17.273 + 59 =
  18. 18.496 + 67 =
  19. 19.107 + 19 =
  20. 20.378 + 99 =
  21. 21.487 + 87 =
  22. 22.347 + 19 =
  23. 23.452 + 99 =
  24. 24.234 + 38 =
  25. 25.109 + 89 =
  26. 26.465 + 17 =
  27. 27.94 + 29 =
  28. 28.273 + 47 =
  29. 29.192 + 59 =
  30. 30.271 + 28 =
  31. 31.172 + 67 =
  32. 32.192 + 38 =
  33. 33.272 + 38 =
  34. 34.114 + 57 =
  35. 35.434 + 97 =
  36. 36.408 + 97 =
  37. 37.253 + 58 =
  38. 38.260 + 79 =
  39. 39.309 + 78 =
  40. 40.322 + 87 =

Answer key

  1. 578
  2. 320
  3. 381
  4. 102
  5. 387
  6. 367
  7. 135
  8. 489
  9. 182
  10. 385
  11. 127
  12. 397
  13. 331
  14. 132
  15. 522
  16. 77
  17. 332
  18. 563
  19. 126
  20. 477
  21. 574
  22. 366
  23. 551
  24. 272
  25. 198
  26. 482
  27. 123
  28. 320
  29. 251
  30. 299
  31. 239
  32. 230
  33. 310
  34. 171
  35. 531
  36. 505
  37. 311
  38. 339
  39. 387
  40. 409

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