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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 726 · 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. 1.101 + 27 =
  2. 2.496 + 37 =
  3. 3.497 + 67 =
  4. 4.462 + 99 =
  5. 5.373 + 59 =
  6. 6.461 + 28 =
  7. 7.359 + 27 =
  8. 8.64 + 97 =
  9. 9.183 + 68 =
  10. 10.186 + 99 =
  11. 11.284 + 57 =
  12. 12.142 + 68 =
  13. 13.95 + 38 =
  14. 14.130 + 87 =
  15. 15.411 + 97 =
  16. 16.157 + 17 =
  17. 17.252 + 67 =
  18. 18.97 + 49 =
  19. 19.162 + 49 =
  20. 20.40 + 79 =
  21. 21.446 + 19 =
  22. 22.401 + 78 =
  23. 23.230 + 87 =
  24. 24.387 + 18 =
  25. 25.120 + 69 =
  26. 26.464 + 19 =
  27. 27.70 + 17 =
  28. 28.33 + 39 =
  29. 29.99 + 59 =
  30. 30.472 + 48 =
  31. 31.356 + 98 =
  32. 32.375 + 37 =
  33. 33.448 + 49 =
  34. 34.452 + 28 =
  35. 35.417 + 29 =
  36. 36.381 + 77 =
  37. 37.33 + 37 =
  38. 38.90 + 37 =
  39. 39.115 + 18 =
  40. 40.159 + 68 =

Answer key

  1. 128
  2. 533
  3. 564
  4. 561
  5. 432
  6. 489
  7. 386
  8. 161
  9. 251
  10. 285
  11. 341
  12. 210
  13. 133
  14. 217
  15. 508
  16. 174
  17. 319
  18. 146
  19. 211
  20. 119
  21. 465
  22. 479
  23. 317
  24. 405
  25. 189
  26. 483
  27. 87
  28. 72
  29. 158
  30. 520
  31. 454
  32. 412
  33. 497
  34. 480
  35. 446
  36. 458
  37. 70
  38. 127
  39. 133
  40. 227

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