Channel: Vsauce2

Category: Education

Tags: math riddlesbrain teasers mind tricksbrain teaser puzzlescrazy math videosmath puzzlesvsaucemath randomcrazy math factsbrain teasers for kidsvsauce2random math problemsmath history factsmath magicvsausemath gamesweird mathvsause2brain teasersrandom math factsmath tricks shortsmath kidshappy numbersrandom math questionssad numberscrazy math trickcrazy mathematicsmath historymath tricksmath tricks for fast calculation

Description: Some numbers are happy. Some numbers are sad. How can you tell the difference?! It's actually really easy. Square the number, then square the resulting digits and add them together. Do it again and again... if you get to 1, that number is happy. And if you can't get to 1, the number is stuck in an eternal abyss of sadness and misery. #shorts