D. O. Shklarsky (1918–1942)

Very good. Includes 320 problems divided into different categories along with thorough solutions. Includes recreational problems and some real head-scratchers. Some merely require logic, while other problems require some grounding in trigonometry and algebra. Most of the book is devoted to the solutions to the problems, so you aren't left hanging at the end of the day.

I mostly got this book to recover some of my lost math, and a lot of these problems will surely get you more of a grounding show more in math. show less