The Casio fx-83GT CW is the new upgraded version of the Casio fx-83GT X (the UKs best-selling scientific calculator), containing additional features, to include a high definition display and improved menu navigation. 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 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.