The Casio fx-991CW+ UK is UKs best-selling Advanced Scientific Calculator and the ultimate scientific calculator. Now specifically designed for the UK, it replaces the fx-991CW, and includes UK curriculum specific functions such as HCF, LCM and recurring decimals. Approved for Key stages 3, 4 and 5, recommended for Advanced/Further GCSE, A/AS level (minimum requirement) and Highers. ​ Recommended for students at higher and further maths level, and those seeking to achieve and progress their education within maths and STEM. Allowed in every UK exam where a calculator can be used.​ Dual powered, solar with battery backup and auto power-off. ​ Clip-on protective hard cover included 540+ functions ​ Free 3 year guarantee included ​ Reliable and Durable: Built for Learning. Made to Last.​