In this Grade 5 Illustrative Mathematics lesson (Chapter 7, Lesson 2), students practice plotting and naming points on a coordinate grid, including points on the horizontal and vertical axes where one coordinate equals zero. Students explore how points sharing the same x- or y-coordinate align on a horizontal or vertical line, reinforcing precision in writing coordinate pairs such as (3, 0) and (0, 2). The lesson builds toward standard 5.G.A.1 and deepens understanding of coordinate structure through estimation and reasoning activities.
Section 1
Plot points on a rectangular coordinate system
An ordered pair, , gives the coordinates of a point in a rectangular coordinate system. The first number is the -coordinate. The second number is the -coordinate.
The point is called the origin. It is the point where the -axis and -axis intersect.
Points with a -coordinate equal to are on the -axis, and have coordinates .
Expand to review the lesson summary and core properties.
Section 1
Plot points on a rectangular coordinate system
An ordered pair, , gives the coordinates of a point in a rectangular coordinate system. The first number is the -coordinate. The second number is the -coordinate.
The point is called the origin. It is the point where the -axis and -axis intersect.
Points with a -coordinate equal to are on the -axis, and have coordinates .