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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 579 · 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. 1.471 + 68 =
  2. 2.171 + 77 =
  3. 3.156 + 88 =
  4. 4.96 + 19 =
  5. 5.465 + 39 =
  6. 6.166 + 37 =
  7. 7.461 + 77 =
  8. 8.261 + 57 =
  9. 9.82 + 38 =
  10. 10.357 + 17 =
  11. 11.33 + 27 =
  12. 12.341 + 39 =
  13. 13.417 + 98 =
  14. 14.276 + 37 =
  15. 15.89 + 59 =
  16. 16.64 + 97 =
  17. 17.47 + 58 =
  18. 18.479 + 58 =
  19. 19.60 + 88 =
  20. 20.434 + 57 =
  21. 21.364 + 47 =
  22. 22.381 + 98 =
  23. 23.108 + 87 =
  24. 24.26 + 17 =
  25. 25.471 + 38 =
  26. 26.105 + 59 =
  27. 27.84 + 88 =
  28. 28.260 + 48 =
  29. 29.424 + 29 =
  30. 30.235 + 17 =
  31. 31.420 + 27 =
  32. 32.214 + 47 =
  33. 33.41 + 88 =
  34. 34.116 + 39 =
  35. 35.81 + 47 =
  36. 36.455 + 59 =
  37. 37.71 + 99 =
  38. 38.105 + 39 =
  39. 39.235 + 17 =
  40. 40.309 + 28 =

Answer key

  1. 539
  2. 248
  3. 244
  4. 115
  5. 504
  6. 203
  7. 538
  8. 318
  9. 120
  10. 374
  11. 60
  12. 380
  13. 515
  14. 313
  15. 148
  16. 161
  17. 105
  18. 537
  19. 148
  20. 491
  21. 411
  22. 479
  23. 195
  24. 43
  25. 509
  26. 164
  27. 172
  28. 308
  29. 453
  30. 252
  31. 447
  32. 261
  33. 129
  34. 155
  35. 128
  36. 514
  37. 170
  38. 144
  39. 252
  40. 337

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