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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 873 · 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. 1.63 + 57 =
  2. 2.43 + 39 =
  3. 3.401 + 28 =
  4. 4.272 + 19 =
  5. 5.314 + 29 =
  6. 6.324 + 29 =
  7. 7.83 + 27 =
  8. 8.340 + 77 =
  9. 9.357 + 19 =
  10. 10.125 + 38 =
  11. 11.478 + 69 =
  12. 12.176 + 67 =
  13. 13.412 + 59 =
  14. 14.233 + 87 =
  15. 15.360 + 17 =
  16. 16.488 + 99 =
  17. 17.135 + 88 =
  18. 18.143 + 37 =
  19. 19.370 + 17 =
  20. 20.358 + 48 =
  21. 21.458 + 97 =
  22. 22.224 + 99 =
  23. 23.251 + 89 =
  24. 24.104 + 67 =
  25. 25.82 + 18 =
  26. 26.125 + 89 =
  27. 27.406 + 88 =
  28. 28.122 + 99 =
  29. 29.390 + 47 =
  30. 30.69 + 57 =
  31. 31.472 + 69 =
  32. 32.117 + 27 =
  33. 33.142 + 18 =
  34. 34.331 + 67 =
  35. 35.153 + 28 =
  36. 36.179 + 49 =
  37. 37.33 + 78 =
  38. 38.213 + 58 =
  39. 39.490 + 79 =
  40. 40.332 + 68 =

Answer key

  1. 120
  2. 82
  3. 429
  4. 291
  5. 343
  6. 353
  7. 110
  8. 417
  9. 376
  10. 163
  11. 547
  12. 243
  13. 471
  14. 320
  15. 377
  16. 587
  17. 223
  18. 180
  19. 387
  20. 406
  21. 555
  22. 323
  23. 340
  24. 171
  25. 100
  26. 214
  27. 494
  28. 221
  29. 437
  30. 126
  31. 541
  32. 144
  33. 160
  34. 398
  35. 181
  36. 228
  37. 111
  38. 271
  39. 569
  40. 400

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