13 math fails that'll make you double check your work

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Original image replaced with Mashable logo
Original image has been replaced. Credit: Mashable

You might not think you need the math you're forced to learn in school, but it will save you the eternal shame of eternal Internet scorn.

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The Internet is forever and if you make dumb, simple math mistakes, we will post it, share it and we will make fun of you forever. Be smart. Double check your work.

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