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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 173 · 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. 1.184 + 58 =
  2. 2.104 + 48 =
  3. 3.494 + 28 =
  4. 4.61 + 79 =
  5. 5.96 + 79 =
  6. 6.409 + 48 =
  7. 7.72 + 88 =
  8. 8.40 + 68 =
  9. 9.44 + 57 =
  10. 10.41 + 68 =
  11. 11.174 + 98 =
  12. 12.334 + 68 =
  13. 13.460 + 18 =
  14. 14.44 + 77 =
  15. 15.363 + 98 =
  16. 16.466 + 98 =
  17. 17.118 + 38 =
  18. 18.78 + 28 =
  19. 19.212 + 68 =
  20. 20.316 + 69 =
  21. 21.43 + 78 =
  22. 22.34 + 17 =
  23. 23.339 + 77 =
  24. 24.486 + 68 =
  25. 25.180 + 99 =
  26. 26.182 + 48 =
  27. 27.199 + 87 =
  28. 28.108 + 49 =
  29. 29.122 + 77 =
  30. 30.108 + 47 =
  31. 31.163 + 58 =
  32. 32.229 + 98 =
  33. 33.477 + 67 =
  34. 34.345 + 39 =
  35. 35.444 + 39 =
  36. 36.203 + 27 =
  37. 37.57 + 98 =
  38. 38.247 + 97 =
  39. 39.374 + 37 =
  40. 40.137 + 67 =

Answer key

  1. 242
  2. 152
  3. 522
  4. 140
  5. 175
  6. 457
  7. 160
  8. 108
  9. 101
  10. 109
  11. 272
  12. 402
  13. 478
  14. 121
  15. 461
  16. 564
  17. 156
  18. 106
  19. 280
  20. 385
  21. 121
  22. 51
  23. 416
  24. 554
  25. 279
  26. 230
  27. 286
  28. 157
  29. 199
  30. 155
  31. 221
  32. 327
  33. 544
  34. 384
  35. 483
  36. 230
  37. 155
  38. 344
  39. 411
  40. 204

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