Как считать проценты в уме

Check out my book “The Best Mental Math Tricks“ Also check out my book “The Joy of Game Theory“ (nearly 5 stars from 15 reviews on Amazon) Learn this mental math trick and you’ll look like a genius when you can solve math problems in your head like a calculator. If you like my videos and want to help more people learn math, you can support me at Patreon: MindYourDecisions on the web Blog: