Make It Simpler: A Practical Guide to Problem Solving in Mathematics

I teach gifted students, and after borrowing this book from my school's teacher resource library for two years, I've finally decided to get my own copy. It's got great math word problems, and my students eat them up! I like that each problem is interesting, with different characters and scenarios (there's a series of humorous problems about an alien colony, for instance). There are also different focuses and levels of difficulty. The book is organized around several approaches students can use for problem-solving -- ideal for math teachers, too.