2 + 2 = 4.

That’s about as much math as I can handle without a calculator on a daily basis. I literally hate doing math more than anything in life, mostly because I’m not good at it—and I hate doing things I’m not good at.

So, when I come across a cool math trick online that claims to make life easier for folks like me, I’m all ears. While calculus is (basically) useless for the average person’s everyday life, multiplication, addition, subtraction, and percentages are all things we should be able to do—and without a calculator. As a big fan of TED Talks, I came across the following video of… more

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