Lesson 2

Lesson Objective

Understand what a loop is
Using different angles to draw shapes
Recognise when an algorithm needs debugging

Starter Challenge

Ask for a student volunteer. Ask the volunteer to jump once on the spot. Using the same words as you did before, ask the student to jump again. After this second jump, repeat the request again. Then again. Now ask the class to consider the following questions:

Would it have been easier for me to ask the student to jump four times?

What if I wanted the student to do it 10 times?

Tell students, “When we’re coding, if I want to repeat an action, that’s called looping.” Ask the class, “Can you think of any other everyday activities where you repeat or loop an instruction?”

Excerpt From: Apple Education. “Get Started with Code 1.” Apple Inc. - Education, 2017. iBooks. https://itunes.apple.com/gb/book/get-started-with-code-1/id1226776727?mt=11

Scratch Challenge

Look at the following code slides and have a discussion on what the code is going to do.

Once the students have had a good go at determining what the code does and what problems there are in the code the students can then go to Scratch and try the code of the final slide.

Questions:

What does 90 degrees mean?
What do you think will happen when I change the numbers in this code?

What does this code do?

Scratch Challenges

The following challenges can be done by the students. They can then record an explanation of their learning and how they did it and upload this explanation to Seesaw.

Challenge 1

Use the code blocks to draw a square in the most efficient manner.
Change the numbers in the code and experiment and see what happens.
Take screenshots of your code and upload them to Seesaw. Record an explanation of what you did.

Challenge 2

Create a colourful pattern in Scratch using loops.
Take a Screenshot of your code and your pattern.
Upload your screen shot to Seesaw and record an explanation on how you did it.

Challenge 3

Draw a triangle
Create a pattern with your triangle by using loops.
Take a screenshot and upload your screen shot to Seesaw and record an explanation on how you did it.

Challenge 4

Draw a circle
Combine your triangles, squares and circles to create an artistic pattern on the screen.
Take a screenshot and upload your screen shot to Seesaw and record an explanation on how you did it.

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