The Coordinate Plane: Lesson 4 - GED® Coordinate Grid

GED Coordinate Grid is the fourth of four self-paced lessons in the “The Coordinate Plane” section of KET’s GED® Geometry Professional Development Online Course. This lesson focuses on how to apply previously-learned concepts about the coordinate plane to the coordinate grid format.

NOTE: This course was created based on the 2002 GED^{®} math test. The geometry instruction in this course is still valid, however, for up-to-date information about the 2014 GED^{®} math test, please visit KET’s GED^{®} Test Info: Mathematics online course.

On the GED^{®} Mathematics Test, students will be asked to plot points on grids that are provided on their answer sheets.

They may need to plot a point on the coordinate grid based on an ordered pair.

They may also need to plot a point to complete a figure.

This lesson focuses on helping students apply what they have learned about the coordinate plane to the coordinate grid test format. You can download a copy of the GED coordinate grid in the Resources section of this course.

Students need to be familiar with the grid format, including how it relates to the coordinate graph that they have worked with and how to “bubble in” their answers correctly.

2Plotting Points

The GED Mathematics Test has a special GED Coordinate Grid. It is made of “bubbles” you can fill in to show locations of points. Each bubble represents an ordered pair on the coordinate plane. Grid 1 shows a point at (2, 3). Grid 2 shows a point at (4, –2).

Plot a point the same way you do with a regular coordinate grid. Start at 0. Use the x-coordinate to move right or left. Then use the y-coordinate to move up or down.

Question Which point on the grid at left has the ordered pair (–3, –4) as its coordinates?

Step 1 Start at 0 in the center. The x-coordinate is –3. It is negative, so move to the left.

Move 3 units to the left.

Step 2 Look at the y-coordinate, which is –4. It is negative, so move down.

Move 4 units down.

Step 3 Find the point where you end up. It is point C.

Point C is located at (–3, –4).

Answer Point C

3Plotting Points to Complete a Figure

You can use the GED Coordinate Grid to show that you know the properties of geometric figures.

You may be asked to plot a point that completes a rectangle, a square, or another figure. The point you plot will be a vertex, or corner, of the figure.

Question What is the point that completes the rectangle in the coordinate plane shown below?

Step 1 Find a fourth point that, when connected to the other three, will form the four corners of a rectangle. First look up and down. The point you need must be in the same column as the point at (–4, –3).

It must have an x-coordinate of–4.

Step 2 Look left and right. The point must also be in the same row as the point at (4, 1).

It must have an x-coordinate of 1.

Step 3 The point is (–4, 1). This is the fourth vertex of the rectangle.

Answer (–4, 1)

4Sample GED Questions

Directions: There are two questions on this page. Each will appear in the blue rectangle below. Click on Question 1 to see the first question, and then select your answer. Click on Question 2 to see the second question, and select your answer. As you solve these problems, consider how you would work through them with your students.

How could you help students locate the point in Question 2?

The Coordinate Plane: GED Coordinate Grid Skill Review

Document

Printable Resource

In this lesson you have learned about the GED^{®} Coordinate Grid. This review consists of key terms and concepts with which you will need to be familiar. Click the view button on the left to access a review sheet.

Below you will also see a Classroom Connection with suggestions for linking this geometry content with your instruction.