this post was submitted on 12 Aug 2025
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Technology

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The Math Hack You Didn’t Know Was in Your Credit Card (www.scientificamerican.com)
submitted 3 days ago by Powderhorn@beehaw.org to c/technology@beehaw.org
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I've been familiar with the concept, but this is by far the best behind-the-scenes explanation I've seen.

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[–] walden@sub.wetshaving.social 9 points 3 days ago

That's pretty neat. I was expecting something basic like "pay it off every month and there's no interest", but this was much more interesting.

It's a method that web pages use to make sure you didn't make a typo in the number.