Ingenious Math Trick Reveals How to Calculte Percentages in Your Head

Ben Stephen's viral tweet reveals a surprisingly simple solution on how to calculate percentages. Why weren't we taught this in school?

Clever Hans - Wikipedia

A math problem stumped experts for 50 years. This grad student from Maine solved it in days - The Boston Globe

How Not to Be Wrong: The Power of Mathematical Thinking: Ellenberg

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The Viral Math Trick Everyone's Talking About – Mind Your Decisions

Math tricks

How to calculate percentages in your head

Amazing Maths Trick