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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 225 · 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. 1.310 + 27 =
  2. 2.87 + 28 =
  3. 3.54 + 77 =
  4. 4.248 + 18 =
  5. 5.367 + 67 =
  6. 6.164 + 87 =
  7. 7.498 + 48 =
  8. 8.83 + 97 =
  9. 9.389 + 37 =
  10. 10.272 + 89 =
  11. 11.495 + 87 =
  12. 12.185 + 77 =
  13. 13.420 + 47 =
  14. 14.426 + 87 =
  15. 15.466 + 17 =
  16. 16.93 + 17 =
  17. 17.296 + 68 =
  18. 18.333 + 79 =
  19. 19.51 + 89 =
  20. 20.338 + 69 =
  21. 21.356 + 49 =
  22. 22.378 + 18 =
  23. 23.252 + 78 =
  24. 24.25 + 89 =
  25. 25.277 + 38 =
  26. 26.306 + 39 =
  27. 27.268 + 37 =
  28. 28.347 + 87 =
  29. 29.333 + 47 =
  30. 30.340 + 18 =
  31. 31.415 + 58 =
  32. 32.222 + 39 =
  33. 33.292 + 59 =
  34. 34.424 + 27 =
  35. 35.334 + 38 =
  36. 36.464 + 28 =
  37. 37.30 + 47 =
  38. 38.447 + 68 =
  39. 39.374 + 97 =
  40. 40.489 + 67 =

Answer key

  1. 337
  2. 115
  3. 131
  4. 266
  5. 434
  6. 251
  7. 546
  8. 180
  9. 426
  10. 361
  11. 582
  12. 262
  13. 467
  14. 513
  15. 483
  16. 110
  17. 364
  18. 412
  19. 140
  20. 407
  21. 405
  22. 396
  23. 330
  24. 114
  25. 315
  26. 345
  27. 305
  28. 434
  29. 380
  30. 358
  31. 473
  32. 261
  33. 351
  34. 451
  35. 372
  36. 492
  37. 77
  38. 515
  39. 471
  40. 556

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