maths Key words

A Acute angle An angle less than 90°. Adjacent Adjacent sides are next to each other and are joined by a common vertex. Algebra Algebra is the branch of mathematics where symbols or letters are used to represent numbers. Angle An angle is formed when two straight lines cross or meet each other at a point. The size of an angle is measured by the amount one line has been turned in relation to the other. Approximate An approximate value is a value that is close to the actual value of a number. Arc Part of a circumference of a circle. Area The amount of space a shape takes up. E.g. the area of the lawn is 35 square metres. Asymmetrical A shape which has no lines of symmetry. Average A value to best represent a set of data. There are three types of average - the mean, the median and the mode. Axis An axis is one of the lines used to locate a point in a coordinate system. B Bearing A three digit angle measured from north in a clockwise direction. BIDMAS A way of remembering the order in which operations are carried out. It stands for Brackets - Indices - Division - Multiplication - Addition - Subtraction. Bisect To divide an angle or shape exactly in half. Brackets Used to determine the order in which operations are carried out. For example, 3 + 4 x 2 = 11 but (3 + 4) x 2 = 14. C Calculate To work out the value of something. This does not have to mean you need a calculator! Centilitre (cl) A measure of volume. 100 centilitres = 1 litre (100 cl = 1 l). 1 centilitre = 10 millilitres (1 cl = 10 ml). Centimetre (cm) A measure of distance. 1 centimetre = 10 millimetres. (1 cm = 10 mm). 100 centimetres = 1 metre. (100 cm = 1 m). Chord A straight line drawn from one point on the edge of a circle to another. Circumference The perimeter of a circle. Coefficient The number in front of an algebraic symbol. For example the coefficient of 5x is 5. Congruent If you can place a shape exactly on top of another then they are said to be congruent. You may rotate, reflex or translate the shape. Constant A letter or symbol whose value always stays the same. The constant Π is a common example. Credit To add money to a bank account. For example, I had £500 credited to my bank account. Cross section The end section created when you slice a 3D shape along it's length. Cube number The product when an integer is multiplied by itself twice. For example 5 cubed = 5 x 5 x 5 = 125. Cuboid A 3D shape with all sides made from rectangles. Cumulative frequency A running total of the frequencies, added up as you go along. D Day A time period of 24 hours. There are 7 days in a week…