TED Talksのインスタグラム(ted) - 1月26日 02時30分

Want to look like a genius in front of your friends? Well, just watch this clip! Mathemagician Art Benjamin explains how to multiply any number by 11 instantly in your head. It’s a fun mental math trick, and it’s part of our new video series, Go Figure! In future episodes, Art will teach you how to square large numbers in a few seconds flat, memorize your credit card number with ease, figure out change for a 20 dollar bill on the spot, and more! Now, everyone can be a “math person.” Visit go.ted.com/gofigureshow for this full episode, and follow TED on Facebook to see new episodes each week!

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