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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 858 · 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. 1.223 + 67 =
  2. 2.123 + 89 =
  3. 3.144 + 48 =
  4. 4.343 + 28 =
  5. 5.122 + 38 =
  6. 6.492 + 39 =
  7. 7.374 + 37 =
  8. 8.457 + 37 =
  9. 9.345 + 59 =
  10. 10.218 + 38 =
  11. 11.113 + 58 =
  12. 12.79 + 78 =
  13. 13.89 + 87 =
  14. 14.464 + 67 =
  15. 15.174 + 87 =
  16. 16.487 + 59 =
  17. 17.281 + 97 =
  18. 18.413 + 97 =
  19. 19.389 + 69 =
  20. 20.236 + 27 =
  21. 21.385 + 67 =
  22. 22.33 + 27 =
  23. 23.423 + 57 =
  24. 24.329 + 27 =
  25. 25.243 + 79 =
  26. 26.473 + 59 =
  27. 27.39 + 27 =
  28. 28.351 + 69 =
  29. 29.75 + 77 =
  30. 30.89 + 89 =
  31. 31.421 + 79 =
  32. 32.153 + 69 =
  33. 33.436 + 97 =
  34. 34.486 + 29 =
  35. 35.266 + 77 =
  36. 36.132 + 19 =
  37. 37.334 + 59 =
  38. 38.38 + 37 =
  39. 39.341 + 69 =
  40. 40.298 + 67 =

Answer key

  1. 290
  2. 212
  3. 192
  4. 371
  5. 160
  6. 531
  7. 411
  8. 494
  9. 404
  10. 256
  11. 171
  12. 157
  13. 176
  14. 531
  15. 261
  16. 546
  17. 378
  18. 510
  19. 458
  20. 263
  21. 452
  22. 60
  23. 480
  24. 356
  25. 322
  26. 532
  27. 66
  28. 420
  29. 152
  30. 178
  31. 500
  32. 222
  33. 533
  34. 515
  35. 343
  36. 151
  37. 393
  38. 75
  39. 410
  40. 365

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