Scratch Part 1: Basics

Check that you know the following:

• Select the view mode for the Scratch environment
• The stage
• Start and stop a program
• The X and Y coordinates
• Select a sprite and check its details
• The four directions (0=up, 90=right, 180=down, -90=left)
• Change a sprite's direction with the blue line
• The rotate buttons: can rotate, left-right, no rotation.
• Combine the blue line with the rotate buttons
• Change the size of a sprite on the stage
• Duplicate and remove a sprite from the stage
• How to add a new sprite: draw, open, open random
• Switch between the tabs that allow you to build an application: Scripts, Costumes, Sounds
• The code block areas - colour coded. Note that double clicking on the blocks will execute them e.g. Move
• The difference between sprites and backgrounds: clicking the stage icon changes 'Costumes' to 'Backgrounds'
• The menu options: file, edit,

Note that each sprite and background has its own code. The code you write when a sprite is selected will apply to that sprite or background only. Note also that the code for backgrounds has fewer features than that for sprites.

Exercises

Variables

Write a program that inputs two values and displays their sum.

Write a program that displays the results of 2+2*2 and (2+2)*2.