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Natural Numbers
 The counting numbers (1,2,3,4,5...)
 All positive numbers

Square Numbers
Numbers that create a perfect square (1,4,9,16,25...)

Triangular Numbers
Numbers that create a perfect triangle (1,3,6,10...)

Rectangular Numbers
Any composite number

Whole Numbers
Natural numbers and 0

Integers
Positive numbers, negative numbers, 0

Rational numbers
A number represented by a ratio or a fraction where the denominator is not 0.

The rule for multiplying and dividing integers:
 Same sign=always positive
 different signs=always negative

Horizontal Slope
A horizontal slope will have an equation of where it meets the y axis. For example, if it crossed the y axis at +5, the equation would be y=5. The slope would be 0.

Vertical slope
A vertical line will have an undefined slope because it will intersect the y axis at an indefinite amount of points.

Slope
a representation of a rate of change as a line on a graph

X axis
The horizontal axis representing the independent variable.

Y axis
The vertical axis representing the dependent variable

Variable
an unknown value in an equation that is usually represented by a letter, such as x, y, r, s, t, a, b, n or k.

Volume
The amount of space within a 3 dimensional object, measured in cm cubed

Area
the space within a 2 dimensional object, measured in units squared

Diameter of a circle
the distance across a circle

radius of a circle
the distance from the edge of the circle to the centre

Circumference of a circle
 the perimeter of the circle
 formula: 2 x pi x radius

Area of a circle
formula: pi x radius^{2}

