10/07/2014 07:22 am ET Updated Dec 06, 2017

15 Photos That Definitively Prove Math Is Still Really, Really Hard

Math is hard. Fortunately, there are some sleuths out there among us who recognize when mistakes are being made.

In a New York minute, you can make terrible mug-buying decisions.

"Does 20 percent sound about right? I'm just gonna go with 20 percent."

Um, can you show how you arrived at that answer?

But who could possibly say which is less?

This is clearly not a deal for penny pinchers.

Or penny givers.

Not sure what's weirder: The math fail or the fact that "light tuna sandwich springwater" exists.

It might be a little more complicated than that.

We can totally see what's hiding underneath that strikethrough.

Temperature apparently does not follow the basic rules of arithmetic.

The other two pieces? Don't you worry about them.

The saying "less is more" couldn't be more true.

Whoa, somebody needs to take it easy on the cookies.

In this case, red means "STOP! Buying this would be a huge ripoff."

Not so suave, Suave.