Coordinate plane worksheets are needed for fourth grade and up because fourth grade is when you learn basic graphing and that is when you would need a coordinate plane worksheet.
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If you want to find great coordinate plane worksheets, one place to start is http://www.shodor.org/interactivate/activities/PerimeterExplorer/ and another wonderful math website is http://xtramath.org.
The coordinate plane is sometimes call the Cartesian plane because Rene Descartes is often credited with inventing the coordinate plane and so the coordinate plane is sometimes called the Cartesian plane,in his honor.
the coordinate plane is a map of points
The Rectangular Coordinate Plane
It means to put the coordinates you were given on the coordinate plane. Ex. (-3,2) you find it the on the coordinate plane and then you plot it or graph it