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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 108 · 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. 1.235 + 27 =
  2. 2.292 + 47 =
  3. 3.120 + 19 =
  4. 4.32 + 17 =
  5. 5.363 + 17 =
  6. 6.188 + 99 =
  7. 7.58 + 39 =
  8. 8.111 + 38 =
  9. 9.358 + 29 =
  10. 10.191 + 78 =
  11. 11.218 + 78 =
  12. 12.26 + 87 =
  13. 13.75 + 27 =
  14. 14.113 + 58 =
  15. 15.347 + 99 =
  16. 16.356 + 88 =
  17. 17.177 + 18 =
  18. 18.274 + 28 =
  19. 19.340 + 77 =
  20. 20.364 + 39 =
  21. 21.52 + 89 =
  22. 22.158 + 87 =
  23. 23.84 + 97 =
  24. 24.176 + 19 =
  25. 25.378 + 38 =
  26. 26.445 + 18 =
  27. 27.76 + 38 =
  28. 28.377 + 69 =
  29. 29.450 + 77 =
  30. 30.423 + 18 =
  31. 31.114 + 17 =
  32. 32.445 + 28 =
  33. 33.483 + 99 =
  34. 34.219 + 39 =
  35. 35.181 + 49 =
  36. 36.331 + 77 =
  37. 37.387 + 88 =
  38. 38.127 + 68 =
  39. 39.159 + 39 =
  40. 40.369 + 98 =

Answer key

  1. 262
  2. 339
  3. 139
  4. 49
  5. 380
  6. 287
  7. 97
  8. 149
  9. 387
  10. 269
  11. 296
  12. 113
  13. 102
  14. 171
  15. 446
  16. 444
  17. 195
  18. 302
  19. 417
  20. 403
  21. 141
  22. 245
  23. 181
  24. 195
  25. 416
  26. 463
  27. 114
  28. 446
  29. 527
  30. 441
  31. 131
  32. 473
  33. 582
  34. 258
  35. 230
  36. 408
  37. 475
  38. 195
  39. 198
  40. 467

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