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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 804 · 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. 1.27 + 37 =
  2. 2.43 + 77 =
  3. 3.335 + 78 =
  4. 4.313 + 28 =
  5. 5.277 + 67 =
  6. 6.223 + 77 =
  7. 7.422 + 27 =
  8. 8.266 + 87 =
  9. 9.492 + 39 =
  10. 10.108 + 57 =
  11. 11.91 + 39 =
  12. 12.32 + 48 =
  13. 13.177 + 49 =
  14. 14.308 + 28 =
  15. 15.228 + 18 =
  16. 16.308 + 28 =
  17. 17.450 + 77 =
  18. 18.189 + 57 =
  19. 19.220 + 78 =
  20. 20.94 + 27 =
  21. 21.363 + 47 =
  22. 22.342 + 38 =
  23. 23.440 + 99 =
  24. 24.146 + 69 =
  25. 25.101 + 28 =
  26. 26.283 + 77 =
  27. 27.132 + 29 =
  28. 28.288 + 59 =
  29. 29.473 + 38 =
  30. 30.222 + 69 =
  31. 31.191 + 29 =
  32. 32.225 + 89 =
  33. 33.33 + 38 =
  34. 34.80 + 67 =
  35. 35.42 + 67 =
  36. 36.358 + 27 =
  37. 37.414 + 59 =
  38. 38.262 + 77 =
  39. 39.471 + 67 =
  40. 40.103 + 39 =

Answer key

  1. 64
  2. 120
  3. 413
  4. 341
  5. 344
  6. 300
  7. 449
  8. 353
  9. 531
  10. 165
  11. 130
  12. 80
  13. 226
  14. 336
  15. 246
  16. 336
  17. 527
  18. 246
  19. 298
  20. 121
  21. 410
  22. 380
  23. 539
  24. 215
  25. 129
  26. 360
  27. 161
  28. 347
  29. 511
  30. 291
  31. 220
  32. 314
  33. 71
  34. 147
  35. 109
  36. 385
  37. 473
  38. 339
  39. 538
  40. 142

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