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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 210 · 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. 1.483 + 37 =
  2. 2.412 + 19 =
  3. 3.398 + 39 =
  4. 4.448 + 18 =
  5. 5.279 + 37 =
  6. 6.157 + 99 =
  7. 7.301 + 18 =
  8. 8.100 + 29 =
  9. 9.184 + 18 =
  10. 10.97 + 27 =
  11. 11.152 + 18 =
  12. 12.51 + 38 =
  13. 13.328 + 18 =
  14. 14.251 + 69 =
  15. 15.62 + 97 =
  16. 16.422 + 47 =
  17. 17.445 + 18 =
  18. 18.275 + 69 =
  19. 19.33 + 78 =
  20. 20.226 + 18 =
  21. 21.215 + 18 =
  22. 22.252 + 28 =
  23. 23.381 + 59 =
  24. 24.410 + 38 =
  25. 25.402 + 88 =
  26. 26.334 + 29 =
  27. 27.388 + 28 =
  28. 28.416 + 87 =
  29. 29.244 + 29 =
  30. 30.46 + 57 =
  31. 31.447 + 38 =
  32. 32.471 + 87 =
  33. 33.232 + 89 =
  34. 34.454 + 87 =
  35. 35.416 + 37 =
  36. 36.234 + 17 =
  37. 37.104 + 29 =
  38. 38.104 + 78 =
  39. 39.207 + 97 =
  40. 40.466 + 29 =

Answer key

  1. 520
  2. 431
  3. 437
  4. 466
  5. 316
  6. 256
  7. 319
  8. 129
  9. 202
  10. 124
  11. 170
  12. 89
  13. 346
  14. 320
  15. 159
  16. 469
  17. 463
  18. 344
  19. 111
  20. 244
  21. 233
  22. 280
  23. 440
  24. 448
  25. 490
  26. 363
  27. 416
  28. 503
  29. 273
  30. 103
  31. 485
  32. 558
  33. 321
  34. 541
  35. 453
  36. 251
  37. 133
  38. 182
  39. 304
  40. 495

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