New student-friendly textbook introducing common calculations encountered regularly in both personal and business scenarios. * Presents calculations and problems in a clear and logical manner using humour and illustrations to aid understanding. * Positions the concepts of maths and calculations in the real world and demonstrates the importance of maths in everyday life. * Demonstrates how to use a calculator accurately to perform extended calculations, as well as how to perform simple calculations without a calculator. * Clearly explains percentages, law of indices, rules of logarithms, simple and compound interest, payroll and associated taxes, VAT, net profit and loss and algebra, including quadratic equations. * Illustrates how to mathematise scenarios, make an initial model, decide on appropriate mathematical techniques and tools, examine relationships and assumptions, make adjustments and present results and conclusions. * Includes sample questions and answers along with graded end-of-chapter questions. Specifically written for the revised NFQ Level 4 modules Business Calculations (4N2279) and Functional Mathematics (4N2138) modules, as awarded by QQI.