Can You Solve The Four 9s Puzzle?

Can you make 100 from four 9s using common mathematical operations? How many solutions can you find? Special thanks this month to: Lee Redden, Mike Robertson, Daniel Lewis, Kyle. Thanks to all supporters on Patreon! http://www.patreon.com/mindyourdecisions

0:00 puzzle
1:42 brainstorming
3:31 main solution
4:16 simple
5:59 trig
9:44 clever
10:19 genius

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Видео Can You Solve The Four 9s Puzzle? канала MindYourDecisions