Unit 3 – Scratch

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Scratch – Simple Programming

Creating Shapes

Unit 3 – Scratch

Unit Overview

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Objectives Understand why computer programming scripts are used.

Understand the layout of the Scratch software.

Understand the use of basic motion and repeat commands.

Understand the use of Variables as place holders for information.

Understand what an algorithm is and how it can be used in programming.

Outcomes TimeTask 1 Create shapes in Scratch using basic commands.

Task 2 Create shapes in Scratch using the repeat command.

Task 3 Create a script containing suitable variables.

Task 4 Write an algorithm and create a simple Program to create all of the shapes from the previous tasks

Unit 3 – Scratch

Starter (Feature of Scratch)

Stage

Create new Sprite

Different types of Commands

SpriteScripts

Unit 3 – Scratch

Starter (Label the Shapes)

34 5 6

7 8 10 12

Triangle

Heptagon HexagonPentagon

Square

Octagon

Decagon Dodecagon

Unit 3 – Scratch

Starter (Working out Exterior angle)

4 5

360/3 (Sides)

120 Degrees

Work out the exterior angle for the

following shapes

Degrees DegreesDegrees

Tip: To work out the exterior angle you need to divide the number of sides by

360 degrees.

Unit 3 – Scratch

Starter – Complete the missing instructions

Steps Actions

1 3 steps forward

2 Rotate 90 degrees

3 6 steps forward

4

5

6

7

8 Finish Start

6 steps

3 steps

Steps Actions

1 Rotate 120 degrees

2 3 steps forward

3

4

5

6

7 FinishStart

3 steps

Unit 3 – Scratch

Starter – Algorithms

Write an algorithm to send an email to your teacher.

Unit 3 – Scratch

Task 1 – Create the following shapes

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1. Create the following shapes in scratch using basic commands.

2. Print screen (Shapes Worksheets) and annotate your scripts for each shape.

4 53

Unit 3 – Scratch

Task 2 – Repeat Command

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7 8 10 12

1. Create the following shapes in scratch using the repeat command.

2. Print screen (Shapes Worksheets) and annotate your scripts for each shape.

Unit 3 – Scratch

Task 3 – Variables

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• Variables act as “place holders" for data in a computer program.

The answer to each question will be stored in the relevant

variable.

The answer to the question “What shape are you

drawing” will be stored in the shape variable.

Task: Create variable to store the answers from the following questions:

1) What shape are you drawing?2) How many sides does your shape have?3) What is the exterior angle for this shape?4) How many steps would you like to take for each side?

Unit 3 – Scratch

Tasks – Algorithms

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• Algorithms are rules/steps/instructions which need to be followed in order to complete a particular task:

• Write an algorithm for the following scenarios:– Getting ready in the morning for school– Making a cup of tea

Unit 3 – Scratch

Tasks 4 – Create a simple Program to create all of the shapes from the previous tasks

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1. You program needs to include:

1. Control command to start the script

2. Variables to store information about the shape (shape, sides, angles, steps etc. )

3. Repeat command4. Pen up and Pen down command

2. Write an algorithm for this task.3. You can additional script to you

program.

Unit 3 – Scratch

Plenary – Refer to the Lesson Objectives

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Plenary Task (Q&A)Peer assess each other scripts.Discuss the advantages for creating a program to create shapes. Discuss the levels pupils have achieved for this task. Questions: Do you know why a repeat commands is used?Question: What is the purpose of an algorithm? Question: What is the purpose of variables?

Objectives Understand why computer programming scripts are used.

Understand the layout of the Scratch software.

Understand the use of basic motion and repeat commands.

Understand the use of Variables as place holders for information.

Understand what an algorithm is and how it can be used in programming.