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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 812 · 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. 1.117 + 69 =
  2. 2.463 + 39 =
  3. 3.489 + 28 =
  4. 4.34 + 87 =
  5. 5.406 + 98 =
  6. 6.464 + 39 =
  7. 7.84 + 88 =
  8. 8.469 + 77 =
  9. 9.245 + 87 =
  10. 10.257 + 38 =
  11. 11.433 + 97 =
  12. 12.110 + 99 =
  13. 13.431 + 18 =
  14. 14.436 + 38 =
  15. 15.260 + 77 =
  16. 16.389 + 17 =
  17. 17.346 + 59 =
  18. 18.130 + 97 =
  19. 19.427 + 67 =
  20. 20.125 + 49 =
  21. 21.267 + 58 =
  22. 22.410 + 77 =
  23. 23.49 + 97 =
  24. 24.45 + 27 =
  25. 25.361 + 17 =
  26. 26.226 + 28 =
  27. 27.48 + 27 =
  28. 28.345 + 77 =
  29. 29.482 + 78 =
  30. 30.59 + 48 =
  31. 31.293 + 17 =
  32. 32.326 + 38 =
  33. 33.489 + 99 =
  34. 34.312 + 87 =
  35. 35.227 + 79 =
  36. 36.253 + 59 =
  37. 37.149 + 58 =
  38. 38.28 + 39 =
  39. 39.246 + 19 =
  40. 40.243 + 88 =

Answer key

  1. 186
  2. 502
  3. 517
  4. 121
  5. 504
  6. 503
  7. 172
  8. 546
  9. 332
  10. 295
  11. 530
  12. 209
  13. 449
  14. 474
  15. 337
  16. 406
  17. 405
  18. 227
  19. 494
  20. 174
  21. 325
  22. 487
  23. 146
  24. 72
  25. 378
  26. 254
  27. 75
  28. 422
  29. 560
  30. 107
  31. 310
  32. 364
  33. 588
  34. 399
  35. 306
  36. 312
  37. 207
  38. 67
  39. 265
  40. 331

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