# Any simple checksum methods for CC receipts with tip?

**URL:** <https://boards.straightdope.com/t/any-simple-checksum-methods-for-cc-receipts-with-tip/552427>\
**Category:** Factual Questions\
**Created:** [September 2, 2010, 8:49pm UTC](https://boards.straightdope.com/t/any-simple-checksum-methods-for-cc-receipts-with-tip/552427 "2010-09-02T20:49:08Z")\
**Posts on this page:** 1\
**Page:** 4

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**Author:** ![robcaro](https://avatars.discourse-cdn.com/v4/letter/r/df705f/32.png) [@robcaro](https://boards.straightdope.com/u/robcaro)\
**Post date:** [September 6, 2010, 8:28pm UTC](https://boards.straightdope.com/t/any-simple-checksum-methods-for-cc-receipts-with-tip/552427/61 "2010-09-06T20:28:15Z")

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> [@Baracus](#):
>
> > [@qpw3141](#):
> >
> > How many restaurants still use this ancient method with CC’s? 😕
> > 
> > Whenever I use a CC in a restaurant the waiter brings the CC machine to the table and I key in the tip. It then prints out the receipt showing the bill, tip and total.
> > 
> > So the restaurant never gets hold of my card and I can see that everything’s correct.
> 
> Granted that I don’t go out all that often, but I have never once been to a place that did this.

I think that all you need to do is ask and they will bring the CC machine. That is what we do here in Bogota, Colombia

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