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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 481 · 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. 1.137 + 47 =
  2. 2.184 + 38 =
  3. 3.351 + 98 =
  4. 4.347 + 67 =
  5. 5.40 + 17 =
  6. 6.234 + 27 =
  7. 7.81 + 67 =
  8. 8.99 + 29 =
  9. 9.408 + 58 =
  10. 10.364 + 27 =
  11. 11.252 + 47 =
  12. 12.77 + 78 =
  13. 13.269 + 27 =
  14. 14.332 + 97 =
  15. 15.494 + 27 =
  16. 16.497 + 68 =
  17. 17.408 + 38 =
  18. 18.335 + 58 =
  19. 19.54 + 79 =
  20. 20.453 + 18 =
  21. 21.238 + 27 =
  22. 22.202 + 47 =
  23. 23.25 + 37 =
  24. 24.363 + 49 =
  25. 25.259 + 18 =
  26. 26.157 + 17 =
  27. 27.155 + 89 =
  28. 28.457 + 79 =
  29. 29.444 + 19 =
  30. 30.347 + 59 =
  31. 31.461 + 38 =
  32. 32.420 + 87 =
  33. 33.105 + 49 =
  34. 34.306 + 98 =
  35. 35.394 + 17 =
  36. 36.254 + 19 =
  37. 37.376 + 97 =
  38. 38.437 + 67 =
  39. 39.422 + 67 =
  40. 40.56 + 48 =

Answer key

  1. 184
  2. 222
  3. 449
  4. 414
  5. 57
  6. 261
  7. 148
  8. 128
  9. 466
  10. 391
  11. 299
  12. 155
  13. 296
  14. 429
  15. 521
  16. 565
  17. 446
  18. 393
  19. 133
  20. 471
  21. 265
  22. 249
  23. 62
  24. 412
  25. 277
  26. 174
  27. 244
  28. 536
  29. 463
  30. 406
  31. 499
  32. 507
  33. 154
  34. 404
  35. 411
  36. 273
  37. 473
  38. 504
  39. 489
  40. 104

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