""Numbers And How To Use Them"" is a comprehensive guide to arithmetic and mathematics, written by John Fenner Brown and originally published in 1892. The book is designed to teach readers how to use numbers in practical and useful ways, using what Brown calls the ""natural method"" of learning. The book covers a wide range of topics, including addition, subtraction, multiplication, division, fractions, decimals, percentages, and more. It also includes...