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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 368 · 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. 1.149 + 69 =
  2. 2.347 + 47 =
  3. 3.89 + 77 =
  4. 4.345 + 89 =
  5. 5.36 + 88 =
  6. 6.274 + 97 =
  7. 7.272 + 29 =
  8. 8.296 + 68 =
  9. 9.343 + 87 =
  10. 10.266 + 17 =
  11. 11.352 + 99 =
  12. 12.104 + 18 =
  13. 13.210 + 18 =
  14. 14.48 + 98 =
  15. 15.158 + 29 =
  16. 16.260 + 47 =
  17. 17.211 + 89 =
  18. 18.184 + 77 =
  19. 19.298 + 88 =
  20. 20.48 + 29 =
  21. 21.350 + 77 =
  22. 22.30 + 79 =
  23. 23.89 + 69 =
  24. 24.76 + 87 =
  25. 25.305 + 89 =
  26. 26.357 + 78 =
  27. 27.134 + 79 =
  28. 28.469 + 47 =
  29. 29.131 + 98 =
  30. 30.384 + 48 =
  31. 31.213 + 59 =
  32. 32.416 + 59 =
  33. 33.60 + 78 =
  34. 34.166 + 59 =
  35. 35.134 + 69 =
  36. 36.468 + 97 =
  37. 37.89 + 49 =
  38. 38.447 + 28 =
  39. 39.423 + 39 =
  40. 40.227 + 39 =

Answer key

  1. 218
  2. 394
  3. 166
  4. 434
  5. 124
  6. 371
  7. 301
  8. 364
  9. 430
  10. 283
  11. 451
  12. 122
  13. 228
  14. 146
  15. 187
  16. 307
  17. 300
  18. 261
  19. 386
  20. 77
  21. 427
  22. 109
  23. 158
  24. 163
  25. 394
  26. 435
  27. 213
  28. 516
  29. 229
  30. 432
  31. 272
  32. 475
  33. 138
  34. 225
  35. 203
  36. 565
  37. 138
  38. 475
  39. 462
  40. 266

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