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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 971 · 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. 1.71 + 17 =
  2. 2.348 + 58 =
  3. 3.154 + 77 =
  4. 4.396 + 19 =
  5. 5.88 + 68 =
  6. 6.457 + 49 =
  7. 7.412 + 88 =
  8. 8.381 + 17 =
  9. 9.432 + 38 =
  10. 10.470 + 78 =
  11. 11.238 + 38 =
  12. 12.339 + 87 =
  13. 13.204 + 89 =
  14. 14.135 + 78 =
  15. 15.183 + 18 =
  16. 16.229 + 27 =
  17. 17.162 + 67 =
  18. 18.48 + 48 =
  19. 19.361 + 17 =
  20. 20.379 + 28 =
  21. 21.280 + 89 =
  22. 22.156 + 87 =
  23. 23.36 + 29 =
  24. 24.84 + 89 =
  25. 25.235 + 97 =
  26. 26.73 + 99 =
  27. 27.150 + 69 =
  28. 28.393 + 57 =
  29. 29.82 + 49 =
  30. 30.250 + 67 =
  31. 31.309 + 38 =
  32. 32.36 + 77 =
  33. 33.327 + 79 =
  34. 34.196 + 97 =
  35. 35.27 + 38 =
  36. 36.65 + 57 =
  37. 37.460 + 68 =
  38. 38.42 + 18 =
  39. 39.153 + 19 =
  40. 40.314 + 59 =

Answer key

  1. 88
  2. 406
  3. 231
  4. 415
  5. 156
  6. 506
  7. 500
  8. 398
  9. 470
  10. 548
  11. 276
  12. 426
  13. 293
  14. 213
  15. 201
  16. 256
  17. 229
  18. 96
  19. 378
  20. 407
  21. 369
  22. 243
  23. 65
  24. 173
  25. 332
  26. 172
  27. 219
  28. 450
  29. 131
  30. 317
  31. 347
  32. 113
  33. 406
  34. 293
  35. 65
  36. 122
  37. 528
  38. 60
  39. 172
  40. 373

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