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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 987 · 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. 1.54 + 99 =
  2. 2.42 + 18 =
  3. 3.361 + 27 =
  4. 4.386 + 69 =
  5. 5.239 + 59 =
  6. 6.440 + 68 =
  7. 7.255 + 97 =
  8. 8.281 + 98 =
  9. 9.326 + 27 =
  10. 10.125 + 48 =
  11. 11.400 + 28 =
  12. 12.393 + 58 =
  13. 13.146 + 17 =
  14. 14.48 + 39 =
  15. 15.348 + 48 =
  16. 16.155 + 69 =
  17. 17.155 + 98 =
  18. 18.43 + 78 =
  19. 19.489 + 87 =
  20. 20.393 + 17 =
  21. 21.137 + 47 =
  22. 22.465 + 59 =
  23. 23.373 + 38 =
  24. 24.43 + 38 =
  25. 25.40 + 97 =
  26. 26.339 + 87 =
  27. 27.392 + 29 =
  28. 28.219 + 57 =
  29. 29.343 + 58 =
  30. 30.391 + 17 =
  31. 31.398 + 97 =
  32. 32.380 + 18 =
  33. 33.465 + 18 =
  34. 34.114 + 37 =
  35. 35.63 + 68 =
  36. 36.177 + 49 =
  37. 37.224 + 67 =
  38. 38.219 + 97 =
  39. 39.216 + 79 =
  40. 40.69 + 17 =

Answer key

  1. 153
  2. 60
  3. 388
  4. 455
  5. 298
  6. 508
  7. 352
  8. 379
  9. 353
  10. 173
  11. 428
  12. 451
  13. 163
  14. 87
  15. 396
  16. 224
  17. 253
  18. 121
  19. 576
  20. 410
  21. 184
  22. 524
  23. 411
  24. 81
  25. 137
  26. 426
  27. 421
  28. 276
  29. 401
  30. 408
  31. 495
  32. 398
  33. 483
  34. 151
  35. 131
  36. 226
  37. 291
  38. 316
  39. 295
  40. 86

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