Math Puzzles

Magic Squares
The basic idea of the magic square puzzle is very simple: Use all the numbers from 1 to 9.

more arithmetic puzzles

Building With Bricks
An architect is building a series of pyramids to use in landscaping a fancy garden.

more algebraic thinking puzzles

Asking for Directions
What is the minimum number of questions you need to ask to find your way to this lighthouse?

more logic puzzles

All the People in the World
Another Fermi question—estimate population and land use.

more number sense puzzles

Stringing Beads
How many possible arrangements of blue and red beads you can make??

more combinatorics puzzles

Around the World
How much rope do you need to circle the Earth?

more geometry puzzles

Different Dice
What are the probabilities of various outcomes of the throw of two dice?

more probability puzzles

The Seven Bridges of Königsberg
Can you cross each bridge just once without missing any?

more topology puzzles

Bottleneck
Explore how repeated random events can lead to predictable outcomes.

more puzzles