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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 648 · 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. 1.54 + 37 =
  2. 2.122 + 89 =
  3. 3.380 + 79 =
  4. 4.115 + 19 =
  5. 5.159 + 59 =
  6. 6.212 + 78 =
  7. 7.456 + 47 =
  8. 8.337 + 37 =
  9. 9.373 + 69 =
  10. 10.439 + 47 =
  11. 11.490 + 28 =
  12. 12.73 + 39 =
  13. 13.42 + 29 =
  14. 14.412 + 78 =
  15. 15.103 + 57 =
  16. 16.228 + 87 =
  17. 17.56 + 99 =
  18. 18.262 + 87 =
  19. 19.276 + 37 =
  20. 20.331 + 38 =
  21. 21.382 + 37 =
  22. 22.490 + 59 =
  23. 23.437 + 27 =
  24. 24.391 + 97 =
  25. 25.454 + 98 =
  26. 26.36 + 39 =
  27. 27.101 + 78 =
  28. 28.96 + 77 =
  29. 29.277 + 48 =
  30. 30.285 + 19 =
  31. 31.115 + 99 =
  32. 32.377 + 37 =
  33. 33.371 + 99 =
  34. 34.411 + 49 =
  35. 35.271 + 48 =
  36. 36.108 + 69 =
  37. 37.291 + 28 =
  38. 38.372 + 48 =
  39. 39.260 + 97 =
  40. 40.176 + 69 =

Answer key

  1. 91
  2. 211
  3. 459
  4. 134
  5. 218
  6. 290
  7. 503
  8. 374
  9. 442
  10. 486
  11. 518
  12. 112
  13. 71
  14. 490
  15. 160
  16. 315
  17. 155
  18. 349
  19. 313
  20. 369
  21. 419
  22. 549
  23. 464
  24. 488
  25. 552
  26. 75
  27. 179
  28. 173
  29. 325
  30. 304
  31. 214
  32. 414
  33. 470
  34. 460
  35. 319
  36. 177
  37. 319
  38. 420
  39. 357
  40. 245

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