Puzzles are a hands-on way to explore simpler and complex mathematical relationships, for everyone from kids to calculus students.

But primes are often considered the building blocks of mathematics, and math itself is the scaffolding that supports everything from quantum theory and smartphone algorithms to the stability of ...

In honor of April Fools’ Day, I offer the puzzling case of the Lesser Fool. In a fictional town, there lived an odd wanderer. People would present him with two amounts of money or goods and ask which ...