Boris A. Kordemsky (1907–1999)

This book is a good book because it is full of puzzles. These can be given as warmups or to do after assignments. It uses different content you will be teaching with as a teacher.

Written in the Soviet Union back in the 70s, this is a good collection of puzzles and mathematical curiosities that are sure to delight anyone interested in math. Contains a wonderful variety of all different levels of puzzles. Not all of them require pure calculation, some require imagination.

Use for warmups or extra credit.