Math

How To Solve This Quickly (2 Minutes No Calculator)

Many tests around the world include a problem like this. How can you calculate this quickly, without making any mistakes? Thanks to all patrons! Special thanks to: Ertugrul Oruç, Michael Anvari, Richard Ohnemus, Shrihari Puranik, Kyle.

Source
https://twitter.com/thebapex/status/1149020375189270528

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