Apparently its more common than I realized. When I looked up real world math mistakes, I found a ton! There was even an article written for the Huffington Post that showed several errors. Click here to see it.
I think I will make a slide show for my kids to see…. Might help drive home the point of always check your work and why it’s important in a very interesting way.
For Parents,Teachers, Scout Leaders & Really Just Everyone! 
The most widespread mistake I see in stores is in the produce section of groceries, where it’s not unusual to find a price sign like “.79¢ (per) lb.” On several occasions, if that kind of mistake has persisted after I’ve pointed it out to the produce manager twice, I’ve forced the store to sell the fruit or vegetable to me for a penny a pound.
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