Book excerpt: Revised edition of the IGCSE Mathematics Core and Extended Coursebook for the 0580 syllabus for examination from 2015. The Cambridge IGCSE® Mathematics Extended Problem-solving Book delivers a range of problems with fully worked solutions that develop students' mathematical thought. The resource gives students the opportunity to practise the range of mathematics skills covered in the Cambridge IGCSE Mathematics (0580) syllabus. The questions in the book encourage students to think widely about how to apply their knowledge to a broad range of tasks and problems. These help develop mathematical logic and key skills, such as reasoning, interpreting, estimating and communicating mathematically.