# Introduce the Cartesian coordinate system using all four quadrants (ACMMG143)

LO: To identify the properties of the Cartesian coordinate system

Know:

• What an Cartesian plane is
• Numbers moving from left to right increase in order
• Numbers moving from right to left decrease in order
• Numbers moving upwards increase in order
• Numbers moving downwards decrease in order

Understand:

• That points have co-ordinates
• Co-ordinates tell us the location of the point on the Cartesian Plane

Do:

• I can locate a point on a Cartesian Plane.

# Cartesian Planes As numbers move to the right on the x-axis, the numbers increase in size.
As the numbers move to the left on the x-axis, the numbers decrease in size.
As the numbers move up on the y-axis, the numbers increase in size.
As the numbers move down on the y-axis, the numbers decrease in size.
In quadrant 1 (top right), both numbers are positive.
In quadrant 2 (top left), the first number is negative, but the second number is positive.
In quadrant 3 (bottom left), both numbers are negative.
In quadrant 4 (bottom right), the first number is positive, but the second number is negative.

# Ordered Pairs

An ordered pair is a pair of numbers which tell you where a point is on the Cartesian Plane.
First number tells you the location on the x-axis, then second number tells you the location on the y-axis.

A way to help you remember is, “Along the Corridor, Up the Stairs.” # Teaching Ideas    