## Launch the Lesson: Ordered Pairs on the Coordinate Plane Floor Plans

Students should already be familiar with integers on a number line.  A great way to describe the coordinate plane is to show how it is made up of two number lines.  The x-axis is the horizontal number line (you can show it on your large grid), and the y-axis is a vertical number line (show how it crossed through the x-axis).  Have the students find and label the x and y axes on the first page of their Coordinate Plane and Ordered Pairs Worksheet.  Explain that they cross at point 0 on the x-axis and 0 on the y-axis.  Have them draw a dot where they intersect and label it with the word “origin”  and  (0,0).  You can ask them, why is this point labeled (0,0)?  Then take that a step further and ask them how to label the rest of the tick marks on each axis.  Be sure to walk around and help students label the axes from -10 to 10.

### The Origin

Now talk about the importance of the origin and have the students think about the word.  The origin is not just where the two lines intersect, but it is the ordered pair (0,0) and is also the starting point.  Origin means to originate – so tell the students to remember to always start at the origin and map out the ordered pairs from there.

Lead the students to understand that the coordinate plane is made up of infinitely many points. The intersection of the two axes divides the plane into four regions called quadrants. The signs of the coordinates vary in each quadrant.

### Axis Confusion

The most difficult part about ordered pairs is that students can forget or confuse which number is the x value and which is the y.  One way to help your students remember is to tell them that x comes first in the alphabet, so it comes first in the ordered pair.  Another way to think about it is to remind students that the first number is x, and tells you how far to move horizontally and the second number is y, and indicates how far to move vertically.  (x,y)  (horizontal, vertical).  Make sure students write (x,y) on their worksheet.

Now it’s time to play the game.  Tell the students that they must direct their partner to at least 3 different ordered pairs on the board.  The goal is to capture as many shapes and prizes as they can!

## The Activity: Ordered Pairs on the Coordinate Plane Activity

1. Send 2 students to stand on the origin.
2. Their partners must pick a card from the table.  The cards have ordered pairs and can be in a stack or spread out, face up.  (Depending on how difficult you want to make it).
3. One of the partners read the card silently (without revealing the ordered pair) and help direct their partners to that ordered pair on the board.  The student giving directions cannot just say the ordered pair.  They must provide directions like “Take 2 steps to the right along the x-axis”.
4. The directions will be read only once, so tell the students to be pay attentively.
5. The student being directed can turn and face any direction, but they can only move vertically or horizontally (not diagonally).   Give the students helpful feedback and praise when they use math terminology or directional words.  When the student arrives at the spot, he/she will say the ordered pair aloud.  The student giving directions holds the card up and the class decides whether they are correct.
6. If a student ends up on a prize or shape, they “gobble it up” and pick a new card.
7. If they land on a blank space, they check the ordered pair and pick a new card.
8. If they land on an obstacle, they read the card and follow the instructions.
9. After 3 cards each, see who gobbled up the most prizes.
10. Send in 2-3 more students and play again.
11. For the first few rounds, it is good for the other students to watch and learn.  You can discuss what was successful and what patterns students started to see.
12. If needed, the groups that are not navigating can use the blank coordinate plane on the worksheet.  Here they should follow the directions given by one team on their own graph.  When they reach the destination, plot the point, label it with the initials of the student who got there and write the ordered pair next to it.

## Reflecting on the Activity Ordered Pairs on the Coordinate Plane

Ask the students to discuss and explain the hardest part.  You can ask questions such as:

• What was harder, giving or receiving the directions?
• Which way did you walk when there was a negative x value?
• What direction did you walk when the y was positive?
• Where would you end up if both x and y were negative?
• Can you describe what the coordinate plane looks like? Does it remind you of anything?
• What patterns did you notice?

## Extensions

Once students know how to locate ordered pairs, a great extension is to do coordinate plane pictures.  This is like a mathematical dot to dot.  There are several free resources, like this one, and many students like finding the pairs and revealing a picture.

Another extension is to create a mathematical battleship game.  I have had students make their own coordinate planes on graph paper, label the origin and axes from -10 to 10.  These can then be put into plastic sleeves.  This way they can use dry erase markers to place their ships.  A ship is made of 2,3,4 or 5 ordered pairs in a row, connected with a line like this: