Quantitative techniques are fundamental to the correct interpretation of commercial reality, and can aid practical business decision-making and problem-solving. Acknowledgements, Mathematical Applications, Revision Mathematics, Keeping Up With Change: Index Numbers, Collecting and Interpreting Data, Collecting Data: Surveys and Samples, Finding Patterns in Data: Charts and Tables, Making Sense of Data: Averages and Measures of Spread, Probability and Statistics, Taking a Chance: Probability, The Shape of Data: Probability Distributions, Interpreting with Confidence: Analysis of Sample Data, Checking Ideas: Testing a Hypothesis, Cause and Effect: Correlation and Regression, Decision-Making Techniques, How to Make Good Decisions, Choosing Wisely: Investment Appraisal, Forecasting: Time Series Analysis, Making the Most of Things: Linear Programming, Planning Large Projects: Network Analysis, Bibliography, Index.