"Recommended with confidence" by The Times Literary Supplement, this lively survey starts with arithmetic and algebra and gradually proceeds to trigonometry and calculus. The author, who is internationally renowned for his innovative teaching methods, offers insights into the pleasures of mathematics that will appeal to readers of all backgrounds. 1943 edition. Reprint of the Penguin Books, Ltd., London, 1943 edition.
Here's a sample of other books in this Dover category
Mathematics for the Nonmathematician by Morris Kline Erudite and entertaining overview follows development of mathematics from ancient Greeks to present. Topics include logic and mathematics, the fundamental concept, differential calculus, probability theory, much more. Exercises and problems.
Descartes' Dream: The World According to Mathematics by Philip J. Davis, Reuben Hersh These provocative essays take a modern look at the 17th-century thinker's dream, examining the influences of mathematics on society, particularly in light of technological advances. 1987 edition.
Flatland: A Romance of Many Dimensions by Edwin A. Abbott Classic of science (and mathematical) fiction — charmingly illustrated by the author — describes the adventures of A. Square, a resident of Flatland, in Spaceland (three dimensions), Lineland (one dimension), and Pointland (no dimensions).