Explore the Scratch program Data Tab which allows you to create and modify your own variables.

### Objectives

• Create and modify variables using the Data Tab.

### Materials

• Per Student:
1 computer (**at least one computer per two students**)

• Per Class:
Computer with projector or SMART board.

### Key Questions

• What does the program in step 4 do? (It counts the number of times you press the space bar to make the sprite move forward. When the sprite reaches the edge, it turns 180 degrees and moves back the opposite way.)

### What To Do

Preparation:

Ensure that all the computers work, and are connected to the internet.
Set up the instructor computer and projector or SMART board.  Log in to the Scratch website.

Activity:

Instructor:

1. Explain that you are going to make it possible to count or keep score during a game
2. On the screen or SMART Board, open a new scratch project and select the Data tab.
3. Demonstrate how to make a new variable called Score.
4. Have students follow along on their own computers as you assemble this logic.

1. Have students run the program to discover what it does.

Students:

1. Go to scratch.mit.edu/starter_projects and open Maze Starter.
2. Modify this program so that it counts the number of times the user hits the blue obstacle.

### Extensions

Survivors

Artist: Jeff Kulak

Jeff is a senior graphic designer at Science World. His illustration work has been published in the Walrus, The National Post, Reader’s Digest and Chickadee Magazine. He loves to make music, ride bikes, and spend time in the forest.

Egg BB

Artist: Jeff Kulak

Jeff is a senior graphic designer at Science World. His illustration work has been published in the Walrus, The National Post, Reader’s Digest and Chickadee Magazine. He loves to make music, ride bikes, and spend time in the forest.

Comet Crisp

Artist: Jeff Kulak

Jeff is a senior graphic designer at Science World. His illustration work has been published in the Walrus, The National Post, Reader’s Digest and Chickadee Magazine. He loves to make music, ride bikes, and spend time in the forest.

T-Rex and Baby

Artist: Michelle Yong

Michelle is a designer with a focus on creating joyful digital experiences! She enjoys exploring the potential forms that an idea can express itself in and helping then take shape.

Buddy the T-Rex

Artist: Michelle Yong

Michelle is a designer with a focus on creating joyful digital experiences! She enjoys exploring the potential forms that an idea can express itself in and helping then take shape.

Geodessy

Artist: Michelle Yong

Michelle is a designer with a focus on creating joyful digital experiences! She enjoys exploring the potential forms that an idea can express itself in and helping then take shape.

Science Buddies

Artist: Ty Dale

From Canada, Ty was born in Vancouver, British Columbia in 1993. From his chaotic workspace he draws in several different illustrative styles with thick outlines, bold colours and quirky-child like drawings. Ty distils the world around him into its basic geometry, prompting us to look at the mundane in a different way.

Western Dinosaur

Artist: Ty Dale

From Canada, Ty was born in Vancouver, British Columbia in 1993. From his chaotic workspace he draws in several different illustrative styles with thick outlines, bold colours and quirky-child like drawings. Ty distils the world around him into its basic geometry, prompting us to look at the mundane in a different way.