Allowed in every UK exam where a calculator can be used. The Casio fx-991 CW is Casio’s most advanced scientific calculator with 540 + mathematical functions. Functions include: QR code to display graphic representation, Powers, roots, reciprocal, fraction calculations, Advanced statistics, Table of values, Ratio, Equation / Matrix / Vector / Inequality / Probability and Complex Number Calculations, Base-N function (hexadecimal/decimal/binary/octal), Random decimal and integer generator, Hours (Degrees)/minutes/seconds.