Smith's Ready Reckoner: Or Key To Mental Calculations is a book written by John C. Smith and first published in 1853. The book is a guide to mental arithmetic, providing readers with a comprehensive set of rules and formulas for performing calculations in their heads. The book is divided into several sections, each covering a different aspect of mental arithmetic, including addition, subtraction, multiplication, and division. The book also includes tables and charts to aid in calculations, as well as examples and practice problems to help readers develop their skills. Smith's Ready Reckoner was widely used in the mid-19th century as a tool for teaching mental arithmetic, and it remains a valuable resource for anyone interested in improving their mental math abilities.This scarce antiquarian book is a facsimile reprint of the old original and may contain some imperfections such as library marks and notations. Because we believe this work is culturally important, we have made it available as part of our commitment for protecting, preserving, and promoting the world's literature in affordable, high quality, modern editions, that are true to their original work.