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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 439 · 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. 1.226 + 28 =
  2. 2.305 + 27 =
  3. 3.377 + 18 =
  4. 4.93 + 37 =
  5. 5.488 + 37 =
  6. 6.172 + 57 =
  7. 7.128 + 99 =
  8. 8.192 + 87 =
  9. 9.332 + 48 =
  10. 10.250 + 19 =
  11. 11.334 + 58 =
  12. 12.96 + 29 =
  13. 13.108 + 28 =
  14. 14.457 + 17 =
  15. 15.327 + 79 =
  16. 16.212 + 18 =
  17. 17.125 + 57 =
  18. 18.32 + 48 =
  19. 19.163 + 27 =
  20. 20.468 + 27 =
  21. 21.157 + 89 =
  22. 22.53 + 27 =
  23. 23.125 + 79 =
  24. 24.339 + 39 =
  25. 25.25 + 59 =
  26. 26.384 + 79 =
  27. 27.116 + 38 =
  28. 28.83 + 87 =
  29. 29.53 + 49 =
  30. 30.325 + 47 =
  31. 31.115 + 58 =
  32. 32.491 + 39 =
  33. 33.326 + 29 =
  34. 34.373 + 77 =
  35. 35.86 + 88 =
  36. 36.401 + 67 =
  37. 37.107 + 38 =
  38. 38.74 + 88 =
  39. 39.59 + 97 =
  40. 40.75 + 29 =

Answer key

  1. 254
  2. 332
  3. 395
  4. 130
  5. 525
  6. 229
  7. 227
  8. 279
  9. 380
  10. 269
  11. 392
  12. 125
  13. 136
  14. 474
  15. 406
  16. 230
  17. 182
  18. 80
  19. 190
  20. 495
  21. 246
  22. 80
  23. 204
  24. 378
  25. 84
  26. 463
  27. 154
  28. 170
  29. 102
  30. 372
  31. 173
  32. 530
  33. 355
  34. 450
  35. 174
  36. 468
  37. 145
  38. 162
  39. 156
  40. 104

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