Stories by Hans-Karl Eder

Hans-Karl Eder is a German mathematician, educator and author who also works as a MINT ambassador to get young people interested in mathematics, computer science, natural sciences and technology.

Illustration of a hand and multiple numbers against a purple background.

MathematicsJune 17, 2025

Math Puzzle: Fill the Polygon

Puzzle out the sequence of numbers that fill these polygons

Hans-Karl Eder

MathematicsApril 15, 2025

Math Puzzle: Construct the Dice

Build a special set of dice in this math puzzle

Hans-Karl Eder

MathematicsOctober 15, 2024

Math Puzzle: Play Architect with These Houses of Cards

Can this house of cards be built?

Hans-Karl Eder

MathematicsSeptember 17, 2024

Math Puzzle: Find the Imposter Number

Can you find the number that doesn't belong?

Hans-Karl Eder