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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 809 · 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. 1.129 + 59 =
  2. 2.333 + 87 =
  3. 3.79 + 37 =
  4. 4.345 + 59 =
  5. 5.446 + 99 =
  6. 6.58 + 68 =
  7. 7.426 + 89 =
  8. 8.181 + 87 =
  9. 9.184 + 18 =
  10. 10.462 + 69 =
  11. 11.350 + 68 =
  12. 12.455 + 29 =
  13. 13.133 + 59 =
  14. 14.478 + 59 =
  15. 15.52 + 68 =
  16. 16.142 + 38 =
  17. 17.225 + 78 =
  18. 18.357 + 29 =
  19. 19.386 + 17 =
  20. 20.267 + 89 =
  21. 21.460 + 87 =
  22. 22.313 + 89 =
  23. 23.412 + 48 =
  24. 24.336 + 39 =
  25. 25.335 + 58 =
  26. 26.165 + 69 =
  27. 27.244 + 17 =
  28. 28.341 + 39 =
  29. 29.41 + 87 =
  30. 30.231 + 19 =
  31. 31.155 + 27 =
  32. 32.27 + 28 =
  33. 33.495 + 59 =
  34. 34.328 + 29 =
  35. 35.58 + 18 =
  36. 36.345 + 38 =
  37. 37.494 + 47 =
  38. 38.66 + 48 =
  39. 39.476 + 88 =
  40. 40.248 + 69 =

Answer key

  1. 188
  2. 420
  3. 116
  4. 404
  5. 545
  6. 126
  7. 515
  8. 268
  9. 202
  10. 531
  11. 418
  12. 484
  13. 192
  14. 537
  15. 120
  16. 180
  17. 303
  18. 386
  19. 403
  20. 356
  21. 547
  22. 402
  23. 460
  24. 375
  25. 393
  26. 234
  27. 261
  28. 380
  29. 128
  30. 250
  31. 182
  32. 55
  33. 554
  34. 357
  35. 76
  36. 383
  37. 541
  38. 114
  39. 564
  40. 317

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