TITLE: What is a good book for learning math, from middle school level?
QUESTION [64 upvotes]: Which books are recommended for learning math from the ground up and review the basics - from middle school  to graduate school math? 
I am about to finish my masters of science in computer science and I can use and understand complex math, but I feel like my basics are quite poor.

REPLY [2 votes]: I think the following books would be great to start learning to think in mathematics

How to read and do proofs by Daniel Solow.
How to solve it  by George Polya.
Mathematics and Plausible reasoning by George Polya.