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Mini Scratch Unit

Lecture notes for mini-Scratch unit for middle school math

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Intro to Programming
Algebra-Geometry
Computer Programming?
 What is programming?
 The process of writing, testing, and maintaining
the source code of computer programs.
 Telling the computer what to do
 Why learn to program?
 Develops logic and problem-solving skills
 Improves attention to detail
 It’s fun!
But I’m Not a Geek!
 Until recently, programming required
knowledge of computer language syntax
Anyone Can Program!
 New tools, like Scratch, allow ANYONE to
create computer programs without learning
complicated syntax.
Programming with Scratch
 Open Scratch from either the desktop icon or
Start Menu
Mini Scratch Unit

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Mini Scratch Unit

  • 2. Computer Programming?  What is programming?  The process of writing, testing, and maintaining the source code of computer programs.  Telling the computer what to do  Why learn to program?  Develops logic and problem-solving skills  Improves attention to detail  It’s fun!
  • 3. But I’m Not a Geek!  Until recently, programming required knowledge of computer language syntax
  • 4. Anyone Can Program!  New tools, like Scratch, allow ANYONE to create computer programs without learning complicated syntax.
  • 5. Programming with Scratch  Open Scratch from either the desktop icon or Start Menu
  • 7. Homework  Make sure you have the latest version of Scratch installed on your Tablet PC  Finish working through the Scratch Getting Started Guide  Feel free to experiment and explore!
  • 8. Scratch Syntax: Part 1 Algebra-Geometry
  • 9. Statements  In programming, a statement is simply a directive that tells the computer to do something. Think of it as a command or an instruction.  In Scratch, any block whose label reads like a command is a statement.
  • 10. Boolean Expressions  Sometimes, you only want a statement to be executed under certain conditions. Such conditions are defined in terms of Boolean expressions.  In programming, a Boolean expression is an expression that is either true or false. In Scratch, any block shaped like an elongated diamond is a Boolean expression.
  • 11. Boolean Expressions  One such block is: After all, it is either true that the mouse button is down or it is false.  Another such block is: After all, it is either true that some number is less than another number or it is false.  With Boolean expressions can we construct conditions.
  • 12. Conditions  In programming, a condition is something that must be true in order for something to happen.  A condition is thus said to "evaluate to true" or "evaluate to false."  In Scratch, any block whose label says "if," "when," or "until" is a sort of conditional construct.
  • 13. Conditions  If Construct: Instruct a sprite to say hello only if, say, the user has depressed the mouse button:  If-Else Construct: Instruct a sprite to say hello or goodbye, depending on whether the user has depressed the mouse button:
  • 14. Conditions  When Construct: Instruct a sprite to do something when an event occurs:  When Construct: Instruct a sprite to wait to do something until a condition is true:
  • 15. Loops  In programming, a loop can induce multiple executions of statements.  In Scratch, any block whose label begins with "forever" or "repeat" is a looping construct.
  • 17. Homework  Complete the Cat Walk Project  You may wish to use the Scratch Reference Guide and the Programming Concepts Handout as resources  Completed projects need to be submitted via Interact by the due date.
  • 18. Scratch Syntax: Part 2 Algebra-Geometry
  • 19. Variables  In programming, a variable is a placeholder for some value, much like x and y are popular variables in algebra.  In Scratch, variables are represented with blocks shaped like elongated circles, uniquely labeled by you.
  • 20. Threads  In programming, a thread is like a mini- program within a program that can execute at the same time as other threads.  In Scratch, any block whose label begins with "when" essentially demarks the start of a thread.
  • 21. Events  An event is a signal from one thread to another.  Blocks whose labels begin with "broadcast" signal events whereas blocks whose labels begin with "when" handle events.
  • 22. Pac Man and Pong  Games like Pac Man use Threads  A Variable could be added to Pong
  • 23. Homework  Complete the Tweak a Game Project  Remember that the video tutorials can be very helpful  Completed projects need to be submitted via Interact by the due date. Don’t forget to include your brief written summary!
  • 24. Scratch Syntax: Your First Game Algebra-Geometry
  • 25. Adding a Level  Levels can be added using threads and events.
  • 28. Homework  Complete the Your First Game Project  You may wish to use the Copter Game and Levels program as resources  Completed projects need to be submitted via Interact by the due date.