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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 864 · 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. 1.482 + 48 =
  2. 2.498 + 77 =
  3. 3.63 + 27 =
  4. 4.256 + 27 =
  5. 5.315 + 78 =
  6. 6.287 + 87 =
  7. 7.484 + 67 =
  8. 8.120 + 19 =
  9. 9.381 + 59 =
  10. 10.242 + 99 =
  11. 11.154 + 47 =
  12. 12.26 + 17 =
  13. 13.226 + 89 =
  14. 14.345 + 88 =
  15. 15.64 + 67 =
  16. 16.424 + 37 =
  17. 17.108 + 47 =
  18. 18.392 + 88 =
  19. 19.37 + 48 =
  20. 20.435 + 47 =
  21. 21.320 + 88 =
  22. 22.375 + 39 =
  23. 23.203 + 79 =
  24. 24.71 + 58 =
  25. 25.114 + 88 =
  26. 26.302 + 49 =
  27. 27.483 + 57 =
  28. 28.419 + 88 =
  29. 29.296 + 49 =
  30. 30.35 + 59 =
  31. 31.309 + 28 =
  32. 32.434 + 77 =
  33. 33.43 + 39 =
  34. 34.63 + 59 =
  35. 35.65 + 17 =
  36. 36.327 + 88 =
  37. 37.362 + 67 =
  38. 38.102 + 78 =
  39. 39.162 + 39 =
  40. 40.413 + 79 =

Answer key

  1. 530
  2. 575
  3. 90
  4. 283
  5. 393
  6. 374
  7. 551
  8. 139
  9. 440
  10. 341
  11. 201
  12. 43
  13. 315
  14. 433
  15. 131
  16. 461
  17. 155
  18. 480
  19. 85
  20. 482
  21. 408
  22. 414
  23. 282
  24. 129
  25. 202
  26. 351
  27. 540
  28. 507
  29. 345
  30. 94
  31. 337
  32. 511
  33. 82
  34. 122
  35. 82
  36. 415
  37. 429
  38. 180
  39. 201
  40. 492

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