This is a collection of puzzles requiring in most cases – high school math. The purpose is not necessarily to solve these problems, but to get you to think about different types of math puzzles. Many of the puzzles are introductions to different areas of math. Most of these puzzles can be done mentally. If you have to write, expect to write no more than a page. Pictures are useful.

“There are three planes”, said Onko, “which take off simultaneously - from Bangalore, Athens, and New York.” “Each plane goes 500 km north, then 500 km east, then 500 km south, and then 500 km west.” “Which plane is closest to its starting point?”, said Onko with a smile.