# Do this math problem in your head.

**URL:** <https://boards.straightdope.com/t/do-this-math-problem-in-your-head/469932>\
**Category:** Miscellaneous and Personal Stuff I Must Share\
**Created:** [October 28, 2008, 2:08pm UTC](https://boards.straightdope.com/t/do-this-math-problem-in-your-head/469932 "2008-10-28T14:08:40Z")\
**Posts on this page:** 2\
**Page:** 10

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**Author:** ![Cattitude](https://avatars.discourse-cdn.com/v4/letter/c/e19b73/32.png) [@Cattitude](https://boards.straightdope.com/u/Cattitude)\
**Post date:** [October 30, 2008, 11:09pm UTC](https://boards.straightdope.com/t/do-this-math-problem-in-your-head/469932/181 "2008-10-30T23:09:56Z")

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4,100

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**Author:** ![FilmGeek](https://avatars.discourse-cdn.com/v4/letter/f/b19c9b/32.png) [@FilmGeek](https://boards.straightdope.com/u/FilmGeek)\
**Post date:** [October 30, 2008, 11:18pm UTC](https://boards.straightdope.com/t/do-this-math-problem-in-your-head/469932/182 "2008-10-30T23:18:38Z")

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4100, but I bet you were thinking 5000

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