Designing Linear Algorithms in Scratch
Learning Objective
At the end of the lesson you will be able to create simple linear algorithms and implement them in Scratch.
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Learning Objective
At the end of the lesson you will be able to create simple linear algorithms and implement them in Scratch.
What do you already know about linear algorithms?
What is a Linear Algorithm?
Brushing your teeth: pick up toothbrush, put toothpaste, brush, rinse, finish.
A linear algorithm is a set of instructions performed in order, from start to finish, without repeating or skipping steps.
Definition
Real Life Example
How Algorithms Work
Algorithms are like a recipe: each step must be completed before moving to the next. In Scratch, each command block represents one step.
Features of Linear Algorithms
No loops or decisions. Steps always follow one another in the same order.
Building a Linear Algorithm in Scratch
Start with a 'when green flag clicked' block. Add command blocks for each action in your algorithm. Check that the steps follow one another with no repeats or branches.
Example: Move and Say Hello
Create a linear algorithm: 1. Move sprite forward, 2. Say 'Hello!', 3. Play a sound. Each block is executed once, in order.
Reflection
How would you design a linear algorithm to draw a square in Scratch? List the steps in order.
Write down 3 things you learned in this lesson.
Write down 2 things you want to know more about.
Ask 1 question about something you haven't quite understood yet.
