The Casio FX-83GT CW+ ClassWiz is the UK's best-selling scientific calculator, and is allowed in every UK exam where a calculator can be used. Recommended and approved for Key Stages 3 & 4 (including GCSE, National and Higher, Junior and Leaving). The FX-83GT CW+ is an upgraded version of the previous Casio FX-83GT X, and contains additional features to include a high definition display and improved menu navigation. The large Natural Textbook Display shows mathematical expressions like roots and fractions as they appear in your textbooks, which increases comprehension because results are easier to understand.