Curious and Interesting Geometry, The Penguin Dictionary of

Prime Numbers

You are a mathematician

The Penguin dictionary of curious and interesting numbers

Games and mathematics

Motivating mathematics

Mindbenders and Brainteasers

Prime numbers

The Penguin book of curious and interesting puzzles

Can you solve these?

Can You Solve These? Mathematical Problems to Test Your Thinking Powers, Series No. 1 (Can You Solve These?)