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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 75 · 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. 1.494 + 17 =
  2. 2.428 + 59 =
  3. 3.357 + 77 =
  4. 4.407 + 59 =
  5. 5.432 + 69 =
  6. 6.397 + 88 =
  7. 7.297 + 48 =
  8. 8.304 + 87 =
  9. 9.81 + 27 =
  10. 10.52 + 37 =
  11. 11.459 + 79 =
  12. 12.323 + 48 =
  13. 13.54 + 48 =
  14. 14.41 + 97 =
  15. 15.275 + 17 =
  16. 16.379 + 88 =
  17. 17.198 + 39 =
  18. 18.412 + 19 =
  19. 19.235 + 78 =
  20. 20.75 + 28 =
  21. 21.398 + 88 =
  22. 22.77 + 39 =
  23. 23.441 + 88 =
  24. 24.392 + 19 =
  25. 25.339 + 19 =
  26. 26.364 + 97 =
  27. 27.440 + 87 =
  28. 28.464 + 78 =
  29. 29.493 + 18 =
  30. 30.376 + 38 =
  31. 31.44 + 78 =
  32. 32.424 + 47 =
  33. 33.404 + 37 =
  34. 34.138 + 19 =
  35. 35.303 + 59 =
  36. 36.339 + 19 =
  37. 37.378 + 67 =
  38. 38.103 + 48 =
  39. 39.50 + 17 =
  40. 40.227 + 78 =

Answer key

  1. 511
  2. 487
  3. 434
  4. 466
  5. 501
  6. 485
  7. 345
  8. 391
  9. 108
  10. 89
  11. 538
  12. 371
  13. 102
  14. 138
  15. 292
  16. 467
  17. 237
  18. 431
  19. 313
  20. 103
  21. 486
  22. 116
  23. 529
  24. 411
  25. 358
  26. 461
  27. 527
  28. 542
  29. 511
  30. 414
  31. 122
  32. 471
  33. 441
  34. 157
  35. 362
  36. 358
  37. 445
  38. 151
  39. 67
  40. 305

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