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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 886 · 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. 1.448 + 68 =
  2. 2.273 + 67 =
  3. 3.268 + 59 =
  4. 4.373 + 39 =
  5. 5.227 + 88 =
  6. 6.41 + 68 =
  7. 7.82 + 68 =
  8. 8.366 + 68 =
  9. 9.490 + 88 =
  10. 10.476 + 58 =
  11. 11.168 + 48 =
  12. 12.450 + 17 =
  13. 13.267 + 99 =
  14. 14.39 + 57 =
  15. 15.174 + 17 =
  16. 16.448 + 47 =
  17. 17.234 + 27 =
  18. 18.477 + 27 =
  19. 19.273 + 19 =
  20. 20.390 + 27 =
  21. 21.200 + 28 =
  22. 22.207 + 48 =
  23. 23.380 + 89 =
  24. 24.107 + 18 =
  25. 25.240 + 47 =
  26. 26.386 + 49 =
  27. 27.120 + 59 =
  28. 28.293 + 18 =
  29. 29.57 + 19 =
  30. 30.139 + 37 =
  31. 31.409 + 78 =
  32. 32.234 + 78 =
  33. 33.189 + 29 =
  34. 34.61 + 79 =
  35. 35.467 + 97 =
  36. 36.104 + 48 =
  37. 37.116 + 19 =
  38. 38.404 + 89 =
  39. 39.472 + 79 =
  40. 40.476 + 49 =

Answer key

  1. 516
  2. 340
  3. 327
  4. 412
  5. 315
  6. 109
  7. 150
  8. 434
  9. 578
  10. 534
  11. 216
  12. 467
  13. 366
  14. 96
  15. 191
  16. 495
  17. 261
  18. 504
  19. 292
  20. 417
  21. 228
  22. 255
  23. 469
  24. 125
  25. 287
  26. 435
  27. 179
  28. 311
  29. 76
  30. 176
  31. 487
  32. 312
  33. 218
  34. 140
  35. 564
  36. 152
  37. 135
  38. 493
  39. 551
  40. 525

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