Can You Tell the Time on This Clock?

This clock is ambiguous — or is it?

IMO 2024 — USA Wins! China 2nd, Korea 3rd.

Plus a Fairytale 4th Place for India

A Nice Factorial Equation from the 2024 Australian Mathematical Olympiad

Solve m! + k! = k! × n! for…

Yes High School Math in China is Hard!🧨

Here is the final problem from the 2024 Gao Kao Math Paper

IMO 2024 Problem 1 — “Explain it Like I’m 12”

An Olympiad Algebra problem explained with only 7th Grade Algebra …

A Tricky Complex Numbers Proof

But easy when you know how!

Draw a square in the complex…

Closed Curve on a Sphere

My favourite 💖 problem from the 2023 AMC 10

Simple Sequence Stumps the World’s Best (IMO 2024 Problem 3)

Here’s a nice way to understand it 🥰

Pythagoras Would Have Loved This Pyramid Theorem! 🥰

A pyramid is constructed by gluing together three…

Slicing a Cube With 8 Planes

is *not* so simple to visualize!