Mathematics discusses the fundamentals of four common branches of Arithmetic, Algebra, Geometry, and Trigonometry. This book contains a number of special features, wherein the rest of the text is fully metricated in accordance with the recommended International System of Units (S.I.), which is the modern form of the metric system. The discussion of logarithms and trigonometry is very straightforward and involves none of the usual mystery associated with these topics. The last two chapters offer an entertaining initiation into the Theory of Probability, a subject of increasing importance and endless fascination. This text also includes tables, among which are the Decimal Equivalents of Sixty-Fourths; Measures, Money, Simple, and Compound Interest; Squares and Square Roots, Cubes and Cube Roots; and Common Logarithms, Sine, Tangent, Secant to 4-figures. The care in presentation and detail of discussion makes this book invaluable as basic groundwork for all mathematical study, possibly as a companion reader to one of the recognized courses such as GCSE or comparable examinations. This book is also readably enjoyable for anyone working independently, whether seeking to recapture forgotten knowledge or studying Mathematics for the first time.