Year 9 Interactive Maths (Second Edition) by G S Rehill, an experienced mathematics author and teacher, helps students learn mathematics better and faster. The software has 337 interactive exercises spanning the following 18 chapters: The Distributive Law, Linear Equations and Inequalities, Pythagoras Theorem, Linear Graphs, Simultaneous Equations, Indices, Surds, Factors, Rational Expressions, Quadratic Equations and Graphs, Ratio and Proportion, Consumer Arithmetic, Geometry, Measurement, Trigonometry, Probability, Statistics and Revision. Questions use the metric system of measurement. Version 5.01.02 are a number of corrections for some errors either in the questions, solutions or support reading material. The software has an improved graphics engine. The software is now compatible with Windows Vista.