Interesting things to make out of paper—from mathematical models to toys.

Tie a Pentagon

One of the simplest ways to fold a pentagon is to tie a knot in a piece of paper. Tie an overhand knot, fold it flat and voila!

See lots of interesting facts about a pentagon and other methods of folding one.
For this project and many others check out the book Amazing Math Projects You Can Build Yourself written for kids 9 to 14 years old.