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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 618 · 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. 1.430 + 59 =
  2. 2.33 + 28 =
  3. 3.426 + 77 =
  4. 4.452 + 58 =
  5. 5.307 + 87 =
  6. 6.75 + 89 =
  7. 7.139 + 28 =
  8. 8.266 + 48 =
  9. 9.41 + 58 =
  10. 10.192 + 78 =
  11. 11.169 + 67 =
  12. 12.199 + 39 =
  13. 13.260 + 47 =
  14. 14.361 + 88 =
  15. 15.194 + 29 =
  16. 16.201 + 69 =
  17. 17.364 + 17 =
  18. 18.211 + 39 =
  19. 19.358 + 27 =
  20. 20.445 + 18 =
  21. 21.293 + 18 =
  22. 22.61 + 89 =
  23. 23.400 + 87 =
  24. 24.382 + 29 =
  25. 25.54 + 58 =
  26. 26.79 + 29 =
  27. 27.171 + 99 =
  28. 28.438 + 98 =
  29. 29.45 + 58 =
  30. 30.142 + 28 =
  31. 31.427 + 67 =
  32. 32.296 + 29 =
  33. 33.376 + 27 =
  34. 34.357 + 27 =
  35. 35.206 + 89 =
  36. 36.67 + 18 =
  37. 37.379 + 98 =
  38. 38.445 + 58 =
  39. 39.335 + 49 =
  40. 40.454 + 98 =

Answer key

  1. 489
  2. 61
  3. 503
  4. 510
  5. 394
  6. 164
  7. 167
  8. 314
  9. 99
  10. 270
  11. 236
  12. 238
  13. 307
  14. 449
  15. 223
  16. 270
  17. 381
  18. 250
  19. 385
  20. 463
  21. 311
  22. 150
  23. 487
  24. 411
  25. 112
  26. 108
  27. 270
  28. 536
  29. 103
  30. 170
  31. 494
  32. 325
  33. 403
  34. 384
  35. 295
  36. 85
  37. 477
  38. 503
  39. 384
  40. 552

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