Title: Introduction to Scratch Lists (Arrays)

Grade Level: 4th-6th grade

Objective: - Students will understand the concept of lists (arrays) in Scratch. - Students will be able to create and manipulate lists in Scratch. - Students will apply their knowledge of lists to create interactive projects.

Materials: - Computers with Scratch installed - Scratch accounts for each student - Scratch List Extension (can be added in Scratch by going to “More Blocks” and selecting “Add an Extension”)

Lesson Plan:

Introduction (10 minutes): 1. Begin the lesson by asking students if they have ever used lists in their daily lives (e.g., making a shopping list, to-do list, etc.). Discuss the purpose and benefits of using lists. 2. Explain that lists can also be used in programming to store and organize multiple pieces of data. Introduce the concept of lists in Scratch, also known as arrays.

Demonstration (15 minutes): 1. Open Scratch on the computer and demonstrate how to create a list. 2. Show students how to add items to the list by using the “add” block from the List Extension. 3. Demonstrate how to access and display items from the list using the “item” block. 4. Show students how to change the value of an item in the list using the “replace item” block. 5. Explain how to use the “length” block to determine the number of items in the list.

Guided Practice (20 minutes): 1. Divide students into pairs or small groups. 2. Provide each group with a computer and ask them to open Scratch. 3. Instruct students to create a new project and add the List Extension. 4. Give students a task to create a list of their favorite animals and display them on the screen. 5. Circulate around the room to assist and monitor students’ progress. 6. Once students have completed the task, have them share their projects with the class.

Independent Practice (15 minutes): 1. Ask students to create a new project individually. 2. Instruct them to create a list of their favorite colors and display them on the screen. 3. Encourage students to experiment with different blocks and functionalities of lists. 4. Allow students to share their projects with the class if time permits.

Conclusion (5 minutes): 1. Recap the main points of the lesson, emphasizing the importance and usefulness of lists in programming. 2. Ask students to reflect on how they can apply their knowledge of lists in future projects. 3. Answer any remaining questions and provide feedback on students’ work.

Extension Activity: For advanced students or as an extension activity, challenge them to create a project where they use lists to store and manipulate data for a game or interactive animation. Encourage creativity and problem-solving skills.