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Arithmetic 6 / 3 means 6 divided by 3, or 6 ÷ 3 on the calculator = 2 2 * 5 means 2 multiplied by 5, or 2 x 5 on the calculator = 10 The Casio fx 83 ES has a handy button for fractions. Shift is on the top left, below it is Abs and below that is the fraction button. Press it and there are two boxes one above a line and one below, use the big blue direction button to move up or down and fill in the fraction you want. Geometry Triangles Quadrilaterals Internal angles of a triangle 180 º Internal angles of a Quadrilateral 360 º Scalene = all three sides different Trapezium = one pair of sides parallel Isosceles = two sides same length Parallelogram = two pairs of sides parallel Right Angled = one right angle Rectangle = four right angles Equilateral = all sides equal Square = four equal sides