Input/Output Machine

Performs operations on a number (the input) to produce another number (the output).

Coordinate Grid

A two-dimentional surface on which a coordinate system has been set up. Has a horizontal axis (X) and a vertical axis (Y).

Cartesian Plane

Another name for a coordinate grid.

Origin

The very centre of a coordinate grid where the X axis and Y axis intersect.

Coordinates

The numbers in an ordered pair that locate a point on the grid (X, Y).

Ordered Pair

Another name for coordinates.

Horizontal Axis

Goes across the page. The X axis.

Vertical Axis

Goes up and down the page. The Y axis.

Commutative Property

Property that states that numbers can be added or multiplied in any order without affecting the sum or the product.

Preservation of Equality

When each side of an equation is changed in the same way, the values remain equal.

Variable

A letter of the alphabet used to represent a number. Often seen in a T-chart or input/output machine.

Equation

Uses the = sumbol to show two things that represent the same amount, for example 5+2=7

Expression

A mathematical statement with numbers and operations, for example 3 x 4 - 2