Math Tricks: The Surprising Wonders of Shapes and Numbers

Math Storm Olympiad Problems

Short-Cut Math

Secret Lives of Numbers: Numerals and Their Peculiarities in Mathematics and Beyond

Geometry, Its Elements and Structure: Second Edition, Edition 2

My Best Mathematical and Logic Puzzles

Challenging Problems in Geometry

The Magic of Math: Solving for x and Figuring Out Why

Algebra: A Complete Introduction: The Easy Way to Learn Algebra

What Is Mathematics, Really?

Alex's Adventures in Numberland: Dispatches from the Wonderful World of Mathematics

536 Puzzles and Curious Problems

Calculus Made Easy: Being a Very-Simplest Introduction to Those Beautiful Methods of Reckoning Which are Generally Called by the Terrifying Names of the Differential Calculus and the Integral Calculus

Concepts of Modern Mathematics

Problems and Solutions for Integer and Combinatorial Optimization: Building Skills in Discrete Optimization