Lesson 4: Plotting Points on a Grid

What Are Ordered Pairs???

• Two numbers – X and Y Components• Show POSITION on a grid (4,3) (2,7) etc.• First # shows “X” position – Horizontal Distance• 2nd # “Y” position – Vertical Distance• ALWAYS write the x before the y!!!

Where Have You Used Grids Before?

• GPS Systems

• Maps

• Battleship???

- Use Co-ordinates to find other ships to destroy!!!

- Letter and # position (ordered pairs) ex) A,7

- Letter and # instead of two #s

Some Other Key Terms

• Plot

- To locate and draw on a co-ordinate grid

• Origin

- The starting point of a grid (more later)

• Vertex

- An endpoint on an object (ex: A square has 4)

Origin of a Grid

• (0,0)

• Where the “X” and “Y” axis CROSS OVER

Some Things to Remember…

• When a number has 0 as one of its co-ordinates, it will lie ON THE AXIS

- ex) 4,0 0,4

• Sometimes a letter on a grid can represent an ordered pair

- A “J” can represent (3,4) on a grid

What is a Line Segment?

• Connects TWO POINTS on a grid

What is the Distance Between Each Point?

• Along the X-axis?• Along the Y-axis?

* Hint: Count the “jumps” between each space

In Your Math Journals…

• Using words, numbers and/or pictures, how do you use ordered pairs to describe and locate points on a grid?

GAMES TIME!!!

Cartesian Plane Bingo!!!

• Choose 5 ordered pairs to plot on your grid

- If all of your pairs are called, you win a prize!!!

- Your co-ordinates can go from 0-4

Cartesian Plane Twister!!!

• Co-ordinates range from 0-7

- I (or sir) will pick an ordered pair for you

- You will spin the spinner and whatever body part it lands on, that’s what body part you put on the grid

Questions

• 1-8 page 122-123