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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 334 · 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. 1.45 + 68 =
  2. 2.199 + 27 =
  3. 3.487 + 19 =
  4. 4.49 + 58 =
  5. 5.460 + 18 =
  6. 6.308 + 77 =
  7. 7.112 + 48 =
  8. 8.133 + 87 =
  9. 9.31 + 67 =
  10. 10.411 + 97 =
  11. 11.442 + 58 =
  12. 12.88 + 99 =
  13. 13.436 + 48 =
  14. 14.347 + 68 =
  15. 15.265 + 97 =
  16. 16.421 + 17 =
  17. 17.258 + 19 =
  18. 18.155 + 57 =
  19. 19.26 + 47 =
  20. 20.482 + 97 =
  21. 21.290 + 97 =
  22. 22.442 + 39 =
  23. 23.108 + 67 =
  24. 24.247 + 67 =
  25. 25.454 + 59 =
  26. 26.288 + 77 =
  27. 27.75 + 97 =
  28. 28.494 + 77 =
  29. 29.72 + 68 =
  30. 30.491 + 28 =
  31. 31.43 + 77 =
  32. 32.81 + 47 =
  33. 33.33 + 28 =
  34. 34.323 + 39 =
  35. 35.106 + 49 =
  36. 36.112 + 58 =
  37. 37.491 + 59 =
  38. 38.338 + 67 =
  39. 39.188 + 98 =
  40. 40.456 + 69 =

Answer key

  1. 113
  2. 226
  3. 506
  4. 107
  5. 478
  6. 385
  7. 160
  8. 220
  9. 98
  10. 508
  11. 500
  12. 187
  13. 484
  14. 415
  15. 362
  16. 438
  17. 277
  18. 212
  19. 73
  20. 579
  21. 387
  22. 481
  23. 175
  24. 314
  25. 513
  26. 365
  27. 172
  28. 571
  29. 140
  30. 519
  31. 120
  32. 128
  33. 61
  34. 362
  35. 155
  36. 170
  37. 550
  38. 405
  39. 286
  40. 525

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