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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 904 · 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. 1.357 + 49 =
  2. 2.475 + 57 =
  3. 3.115 + 69 =
  4. 4.318 + 29 =
  5. 5.82 + 47 =
  6. 6.356 + 97 =
  7. 7.223 + 88 =
  8. 8.473 + 27 =
  9. 9.445 + 88 =
  10. 10.247 + 17 =
  11. 11.25 + 37 =
  12. 12.179 + 97 =
  13. 13.92 + 78 =
  14. 14.499 + 18 =
  15. 15.415 + 68 =
  16. 16.381 + 19 =
  17. 17.436 + 69 =
  18. 18.161 + 89 =
  19. 19.497 + 28 =
  20. 20.246 + 37 =
  21. 21.443 + 48 =
  22. 22.323 + 79 =
  23. 23.339 + 97 =
  24. 24.66 + 49 =
  25. 25.370 + 88 =
  26. 26.242 + 67 =
  27. 27.169 + 19 =
  28. 28.322 + 27 =
  29. 29.461 + 97 =
  30. 30.28 + 28 =
  31. 31.260 + 29 =
  32. 32.370 + 99 =
  33. 33.100 + 39 =
  34. 34.90 + 38 =
  35. 35.313 + 88 =
  36. 36.496 + 69 =
  37. 37.70 + 29 =
  38. 38.167 + 59 =
  39. 39.93 + 19 =
  40. 40.276 + 68 =

Answer key

  1. 406
  2. 532
  3. 184
  4. 347
  5. 129
  6. 453
  7. 311
  8. 500
  9. 533
  10. 264
  11. 62
  12. 276
  13. 170
  14. 517
  15. 483
  16. 400
  17. 505
  18. 250
  19. 525
  20. 283
  21. 491
  22. 402
  23. 436
  24. 115
  25. 458
  26. 309
  27. 188
  28. 349
  29. 558
  30. 56
  31. 289
  32. 469
  33. 139
  34. 128
  35. 401
  36. 565
  37. 99
  38. 226
  39. 112
  40. 344

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