# Need Help with an Algebra(?) Formula

**URL:** <https://boards.straightdope.com/t/need-help-with-an-algebra-formula/747834>\
**Category:** Factual Questions\
**Created:** [March 3, 2016, 4:52pm UTC](https://boards.straightdope.com/t/need-help-with-an-algebra-formula/747834 "2016-03-03T16:52:16Z")\
**Posts on this page:** 1\
**Page:** 2

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**Author:** ![septimus](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/septimus/32/410_2.png) [@septimus](https://boards.straightdope.com/u/septimus)\
**Post date:** [March 4, 2016, 6:42pm UTC](https://boards.straightdope.com/t/need-help-with-an-algebra-formula/747834/21 "2016-03-04T18:42:08Z")

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> [@curtc](#):
>
> how many trailing zeroes does 2016! End with?

⌊2016 / 5⌋ + ⌊2016 / 5[sup]2[/sup]⌋ + ⌊2016 / 5[sup]3[/sup]⌋ + ⌊2016 / 5[sup]4[/sup]⌋  
= 502

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