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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 609 · 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. 1.342 + 27 =
  2. 2.343 + 18 =
  3. 3.269 + 39 =
  4. 4.110 + 29 =
  5. 5.121 + 49 =
  6. 6.81 + 88 =
  7. 7.367 + 28 =
  8. 8.99 + 19 =
  9. 9.85 + 37 =
  10. 10.181 + 99 =
  11. 11.68 + 57 =
  12. 12.242 + 87 =
  13. 13.321 + 28 =
  14. 14.308 + 17 =
  15. 15.226 + 19 =
  16. 16.432 + 79 =
  17. 17.243 + 78 =
  18. 18.57 + 49 =
  19. 19.386 + 37 =
  20. 20.479 + 58 =
  21. 21.427 + 17 =
  22. 22.249 + 78 =
  23. 23.157 + 77 =
  24. 24.325 + 88 =
  25. 25.149 + 17 =
  26. 26.492 + 78 =
  27. 27.28 + 49 =
  28. 28.389 + 19 =
  29. 29.33 + 98 =
  30. 30.382 + 78 =
  31. 31.423 + 79 =
  32. 32.405 + 78 =
  33. 33.182 + 19 =
  34. 34.148 + 49 =
  35. 35.67 + 88 =
  36. 36.77 + 19 =
  37. 37.460 + 17 =
  38. 38.242 + 97 =
  39. 39.174 + 17 =
  40. 40.30 + 29 =

Answer key

  1. 369
  2. 361
  3. 308
  4. 139
  5. 170
  6. 169
  7. 395
  8. 118
  9. 122
  10. 280
  11. 125
  12. 329
  13. 349
  14. 325
  15. 245
  16. 511
  17. 321
  18. 106
  19. 423
  20. 537
  21. 444
  22. 327
  23. 234
  24. 413
  25. 166
  26. 570
  27. 77
  28. 408
  29. 131
  30. 460
  31. 502
  32. 483
  33. 201
  34. 197
  35. 155
  36. 96
  37. 477
  38. 339
  39. 191
  40. 59

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