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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 725 · 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. 1.114 + 47 =
  2. 2.405 + 17 =
  3. 3.227 + 28 =
  4. 4.335 + 59 =
  5. 5.268 + 78 =
  6. 6.222 + 77 =
  7. 7.109 + 29 =
  8. 8.287 + 78 =
  9. 9.280 + 78 =
  10. 10.97 + 38 =
  11. 11.35 + 79 =
  12. 12.372 + 99 =
  13. 13.481 + 49 =
  14. 14.491 + 28 =
  15. 15.390 + 57 =
  16. 16.438 + 67 =
  17. 17.349 + 18 =
  18. 18.334 + 37 =
  19. 19.403 + 88 =
  20. 20.449 + 87 =
  21. 21.255 + 89 =
  22. 22.286 + 78 =
  23. 23.268 + 17 =
  24. 24.265 + 27 =
  25. 25.116 + 97 =
  26. 26.33 + 19 =
  27. 27.99 + 39 =
  28. 28.214 + 99 =
  29. 29.304 + 17 =
  30. 30.29 + 28 =
  31. 31.292 + 17 =
  32. 32.266 + 27 =
  33. 33.87 + 98 =
  34. 34.35 + 19 =
  35. 35.236 + 87 =
  36. 36.255 + 68 =
  37. 37.492 + 79 =
  38. 38.213 + 79 =
  39. 39.212 + 38 =
  40. 40.292 + 17 =

Answer key

  1. 161
  2. 422
  3. 255
  4. 394
  5. 346
  6. 299
  7. 138
  8. 365
  9. 358
  10. 135
  11. 114
  12. 471
  13. 530
  14. 519
  15. 447
  16. 505
  17. 367
  18. 371
  19. 491
  20. 536
  21. 344
  22. 364
  23. 285
  24. 292
  25. 213
  26. 52
  27. 138
  28. 313
  29. 321
  30. 57
  31. 309
  32. 293
  33. 185
  34. 54
  35. 323
  36. 323
  37. 571
  38. 292
  39. 250
  40. 309

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