There's a simple trick to calculate percentages that you probably did not learn in school!
Ben Stephens tweet
https://twitter.com/stephens_ben/status/1102167046115262466
The maths trick that’s blowing up the internet
https://www.news.com.au/lifestyle/health/mind/the-maths-trick-thats-blowing-up-the-internet/news-story/e052077227036da799bb15165b01bb9a
Man’s brilliant maths trick means you’ll never struggle with percentages again
https://www.mirror.co.uk/news/weird-news/mans-brilliant-maths-trick-means-14099670
https://www.tiktok.com/@howie_hua/video/7157357086462987562?lang=en
https://www.mirror.co.uk/lifestyle/people-stunned-over-easy-percentage-33294827
https://twitter.com/stephens_ben/status/1102167046115262466
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
PinkPencilMath video
https://www.popsugar.com/smart-living/see-this-viral-tiktok-math-secret-48351153
https://www.tiktok.com/@pinkpencilmath/video/6933371157831798017
comment
https://www.youtube.com/watch?v=jSA8T-OC1dg&lc=UgxqTgOP7XG089xYNh94AaABAg.9OQqBHzunF39OS2C03OHwN
Abacus vs Indian numerals
https://commons.wikimedia.org/wiki/File:Gregor_Reisch,_Margarita_Philosophica,_1508_(1230×1615).png#/media/File:Houghton_Typ_520.03.736_-_Margarita_philosophica.jpg
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