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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 941 · 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. 1.382 + 78 =
  2. 2.222 + 19 =
  3. 3.177 + 79 =
  4. 4.381 + 88 =
  5. 5.398 + 37 =
  6. 6.320 + 27 =
  7. 7.218 + 88 =
  8. 8.321 + 19 =
  9. 9.62 + 37 =
  10. 10.99 + 59 =
  11. 11.444 + 49 =
  12. 12.249 + 77 =
  13. 13.311 + 87 =
  14. 14.164 + 49 =
  15. 15.364 + 78 =
  16. 16.255 + 98 =
  17. 17.320 + 39 =
  18. 18.298 + 79 =
  19. 19.406 + 29 =
  20. 20.492 + 99 =
  21. 21.336 + 18 =
  22. 22.118 + 68 =
  23. 23.347 + 59 =
  24. 24.86 + 69 =
  25. 25.247 + 77 =
  26. 26.120 + 59 =
  27. 27.220 + 19 =
  28. 28.83 + 28 =
  29. 29.310 + 47 =
  30. 30.89 + 67 =
  31. 31.93 + 97 =
  32. 32.161 + 77 =
  33. 33.322 + 19 =
  34. 34.172 + 77 =
  35. 35.420 + 27 =
  36. 36.42 + 68 =
  37. 37.194 + 99 =
  38. 38.428 + 67 =
  39. 39.428 + 59 =
  40. 40.478 + 17 =

Answer key

  1. 460
  2. 241
  3. 256
  4. 469
  5. 435
  6. 347
  7. 306
  8. 340
  9. 99
  10. 158
  11. 493
  12. 326
  13. 398
  14. 213
  15. 442
  16. 353
  17. 359
  18. 377
  19. 435
  20. 591
  21. 354
  22. 186
  23. 406
  24. 155
  25. 324
  26. 179
  27. 239
  28. 111
  29. 357
  30. 156
  31. 190
  32. 238
  33. 341
  34. 249
  35. 447
  36. 110
  37. 293
  38. 495
  39. 487
  40. 495

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