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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 870 · 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. 1.397 + 27 =
  2. 2.190 + 67 =
  3. 3.99 + 39 =
  4. 4.156 + 87 =
  5. 5.176 + 59 =
  6. 6.115 + 49 =
  7. 7.302 + 77 =
  8. 8.352 + 89 =
  9. 9.82 + 98 =
  10. 10.387 + 58 =
  11. 11.187 + 57 =
  12. 12.152 + 89 =
  13. 13.257 + 77 =
  14. 14.154 + 17 =
  15. 15.354 + 47 =
  16. 16.146 + 69 =
  17. 17.352 + 47 =
  18. 18.47 + 79 =
  19. 19.134 + 37 =
  20. 20.72 + 48 =
  21. 21.353 + 89 =
  22. 22.84 + 29 =
  23. 23.146 + 87 =
  24. 24.489 + 38 =
  25. 25.453 + 47 =
  26. 26.497 + 28 =
  27. 27.229 + 67 =
  28. 28.277 + 39 =
  29. 29.99 + 18 =
  30. 30.38 + 68 =
  31. 31.288 + 47 =
  32. 32.386 + 18 =
  33. 33.37 + 69 =
  34. 34.336 + 17 =
  35. 35.264 + 18 =
  36. 36.81 + 87 =
  37. 37.365 + 97 =
  38. 38.409 + 27 =
  39. 39.420 + 47 =
  40. 40.323 + 49 =

Answer key

  1. 424
  2. 257
  3. 138
  4. 243
  5. 235
  6. 164
  7. 379
  8. 441
  9. 180
  10. 445
  11. 244
  12. 241
  13. 334
  14. 171
  15. 401
  16. 215
  17. 399
  18. 126
  19. 171
  20. 120
  21. 442
  22. 113
  23. 233
  24. 527
  25. 500
  26. 525
  27. 296
  28. 316
  29. 117
  30. 106
  31. 335
  32. 404
  33. 106
  34. 353
  35. 282
  36. 168
  37. 462
  38. 436
  39. 467
  40. 372

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