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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 866 · 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. 1.97 + 87 =
  2. 2.456 + 59 =
  3. 3.394 + 57 =
  4. 4.375 + 27 =
  5. 5.427 + 39 =
  6. 6.44 + 77 =
  7. 7.421 + 57 =
  8. 8.340 + 19 =
  9. 9.406 + 37 =
  10. 10.488 + 48 =
  11. 11.394 + 29 =
  12. 12.143 + 37 =
  13. 13.443 + 49 =
  14. 14.363 + 19 =
  15. 15.72 + 67 =
  16. 16.412 + 58 =
  17. 17.480 + 49 =
  18. 18.414 + 99 =
  19. 19.453 + 49 =
  20. 20.280 + 17 =
  21. 21.448 + 17 =
  22. 22.137 + 28 =
  23. 23.169 + 99 =
  24. 24.369 + 88 =
  25. 25.494 + 59 =
  26. 26.176 + 27 =
  27. 27.179 + 99 =
  28. 28.441 + 69 =
  29. 29.41 + 69 =
  30. 30.269 + 38 =
  31. 31.118 + 27 =
  32. 32.144 + 29 =
  33. 33.334 + 38 =
  34. 34.115 + 68 =
  35. 35.400 + 28 =
  36. 36.275 + 47 =
  37. 37.142 + 28 =
  38. 38.210 + 77 =
  39. 39.291 + 27 =
  40. 40.341 + 47 =

Answer key

  1. 184
  2. 515
  3. 451
  4. 402
  5. 466
  6. 121
  7. 478
  8. 359
  9. 443
  10. 536
  11. 423
  12. 180
  13. 492
  14. 382
  15. 139
  16. 470
  17. 529
  18. 513
  19. 502
  20. 297
  21. 465
  22. 165
  23. 268
  24. 457
  25. 553
  26. 203
  27. 278
  28. 510
  29. 110
  30. 307
  31. 145
  32. 173
  33. 372
  34. 183
  35. 428
  36. 322
  37. 170
  38. 287
  39. 318
  40. 388

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