Problem Solving Books

If you are going to teach mathematics, then you must teach problem solving skills.

I have found two excellent texts on problem solving. One old (free!) and one that is relatively new (in it's 3rd edition). I recommend them both.

1. The Canterbury Puzzles by Henry Ernest Dudeney. 1908

• Project Gutenburg - several digital formats (not pdf)
• freepdfdocs.com - download pdf format

2. Crossing the River with Dogs - Problem Solving Strategies. 1st Edition, 1994, Key Press

•  my resource page

For inspiration and insight as to why you must teach problem solving skills, read A Mathematician's Lament by Paul Lockhart.