This little trick makes math calculations much easier.

Sources/references (March 2019)
https://twitter.com/stephens_b....en/status/1102167046
https://www.news.com.au/lifest....yle/health/mind/the-
https://www.mirror.co.uk/news/....weird-news/mans-bril
http://www.ravimohanmishra.com..../2014/02/X-percent-o

Updated reference June 2021
Pink Pencil Math did a video on TikTok which has over 18 million views. Definitely watch it!
https://www.popsugar.com/smart....-living/see-this-vir
https://www.tiktok.com/@pinkpe....ncilmath/video/69333

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