Need a quick refresher, this is the book for you. Starts out very simply as to what are natural numbers and then moves to integers, then first degree equations, factoring, Algebraic fractions, radicals & exponents, quadratics, then points, lines and planes, and then a little into geometric formulas.

This is one of the books I started with when I was refreshing myself with math. Sometimes it is good going back to the very basics and move your way backup.