Liber Abaci

Liber Abaci is a 1202 Latin essay by Leonardo of Pisa, later known as Fibonacci. It is a work about arithmetic and calculation, written to present European readers with mathematical methods that were not yet standard there. At its center is the Hindu Arabic numeral system, along with the practical way of using positional notation instead of the Roman numeral system that was common at the time.

This book is a good fit for readers interested in the history of mathematics, number systems, and how practical ideas move across cultures. It is especially useful if you want to see how a method of writing and working with numbers could change everyday calculation, not just theory. The tone is instructional rather than literary, so it will appeal most to readers who like early scientific writing and clear explanations of a technical subject.