Sources/references (March 2019)
Fascinating little life hack, for doing percentages:
x% of y = y% of x
So, for example, if you needed to work out 4% of 75 in your head, just flip it and and do 75% of 4, which is easier.
— stephensben at bluesky (@stephens_ben) March 3, 2019
https://www.news.com.au/lifestyle/health/mind/the-maths-trick-thats-blowing-up-the-internet/news-story/e052077227036da799bb15165b01bb9a
https://www.mirror.co.uk/news/weird-news/mans-brilliant-maths-trick-means-14099670
http://www.ravimohanmishra.com/2014/02/X-percent-of-Y-is-same-as-Y-percent-of-X.html
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-viral-tiktok-math-secret-48351153
@pinkpencilmath Do you guys know this?!?! 🤯 #viralmath #mathtricks #pinkpencil #math #fyp #percentages #mathhelp #mathtutor #brainteaser #percent #fractions #maths
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