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Grade 3 - Mathematics
8.18 Points on a Grid

Coordinate plane
  • Coordinate plane has two axes. They intersect at right angle and form four quadrants.
  • The two number lines form the axes.
  • The horizontal number line is called the x-axis.
  • The vertical number line is called the y-axis.
  • The center of the coordinate plane is called the origin. It has the coordinates of (0,0).
  • Locations of points on the plane can be plotted when one coordinate from each of the axes are used. This set of x and y values are called ordered pairs.
  • The points in a grid are named by ordered pairs.
  • The first number gives the position to the right of 0.
  • The second number gives the position above 0.
  • The axes along which the ordered pairs are marked are called co-ordinate axes.
Example: What is the ordered pair of point A?

Answer: (2,1)


Directions: Answer the following questions. Also take a graph paper and plot at least 15 points and label the ordered pair.
Q 1: ____ are ordered pairs of numbers written within parentheses and used to locate points on coordinate axes.
coordinate grid
coordinates
ordered number pairs

Q 2: In the figure name the location or ordered pair of point C.

(5,4)
(1,3)
(5,3)

Q 3: In the figure what is the point with ordered pair (4,5).

D
B
A
C

Q 4: The location of a point A is named by ordered pair (4,5). The second number of the ordered pair tell you that it is _____ units up from zero.
(4,5)
5
4

Q 5: The location of a point on a grid is named by an
location
ordered pair
point
line

Q 6: The location of a point A is named by ordered pair (2,1). The first number of the ordered pair tell you how many units
to the rights a point is from zero
up a point is from zero

Q 7: In the figure what is the point with ordered pair (4,5).

G
F
B
A

Q 8: A device for locating points in a plane is called ____. It is formed by drawing two number lines at right angles to each other and intersecting at their zero points.
coordinate grid
coordinates
ordered number pair

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Question 10: This question is available to subscribers only!


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