Lesson 6: Loops with Scrat

Overview

Building on the concept of repeating instructions from "My Loopy Robotic Friends," this stage will have students using loops to get to the acorn more efficiently on Code.org.

Purpose

In this lesson, students will be learning more about loops and how to implement them in Blockly code. Using loops is an important skill in programming because manually repeating commands is tedious and inefficient. With these Code.org puzzles, students will learn to add instructions to existing loops, gather repeated code into loops, and recognize patterns that need to be repeated.

Agenda

Online Foundation: Preview Loops in Ice Age

Main Activity (30 min)

Wrap Up (5 - 10 min)

Extended Learning

View on Code Studio

Objectives

Students will be able to:

  • Construct a program using structures that repeat areas of code
  • Improve existing code by finding areas of repetition and moving them into looping structures

Preparation

  • (Optional) Pick a couple of puzzles to do as a group with your class.
  • Make sure each student has a journal.

Links

Heads Up! Please make a copy of any documents you plan to share with students.

For the Students

Vocabulary

  • Loop - The action of doing something over and over again.
  • Repeat - To do something again.

Support

Report a Bug

Teaching Guide

Online Foundation: Preview Loops in Ice Age

To finish the connection, preview an online puzzle (or two) as a class.

Content Corner

Teaching this course as a class?

Our grade-aligned CS Fundamentals courses use unplugged lessons to build community and introduce tricky computer science concepts, including loops. Check out the lesson Happy Loops from Course A and Getting Loopy from Course B!

Model: Reveal an entire online puzzle from the progression to come. Work with your class to drag code into the workspace in such a way that Scrat (eventually) gets to the acorn. Make sure to highlight the use of repeat blocks.

Transition: Students should now be ready to transition to computers to complete online puzzles on their own.

Main Activity (30 min)

As students work through the puzzles, see if they can figure out how many blocks they use with a loop vs. without a loop.

Online Puzzles

Teacher Tip:

Show the students the right way to help classmates by:

  • Don’t sit in the classmate’s chair
  • Don’t use the classmate’s keyboard
  • Don’t touch the classmate’s mouse
  • Make sure the classmate can describe the solution to you out loud before you walk away

Circulate: Teachers play a vital role in computer science education and supporting a collaborative and vibrant classroom environment. During online activities, the role of the teacher is primarily one of encouragement and support. Online lessons are meant to be student-centered, so teachers should avoid stepping in when students get stuck. Some ideas on how to do this are:

  • Utilize Pair Programming - Student Video whenever possible
  • Encourage students with questions/challenges to start by asking their partner
  • Unanswered questions can be escalated to a nearby group, who might already know the solution
  • Remind students to use the debugging process before you approach
  • Have students describe the problem that they’re seeing. What is it supposed to do? What does it do? What does that tell you?
  • Remind frustrated students that frustration is a step on the path to learning, and that persistence will pay off.
  • If a student is still stuck after all of this, ask leading questions to get the student to spot an error on their own.

Wrap Up (5 - 10 min)

Journaling

Having students write about what they learned, why it’s useful, and how they feel about it can help solidify any knowledge they obtained today and build a review sheet for them to look to in the future.

Journal Prompts:

  • What was today’s lesson about?
  • Draw one of the Feeling Faces - Emotion Images that shows how you felt about today's lesson in the corner of your journal page.
  • Draw Scrat and an acorn.
  • Draw yourself using a loop to do an everyday activity, like brushing your teeth.

Extended Learning

So Moving

  • Give the students pictures of actions or dance moves that they can do.
    • Have students arrange moves and add loops to choreograph their own dance.
  • Share the dances with the rest of the class.

Connect It Back

  • Find some YouTube videos of popular dances that repeat themselves.
  • Can your class find the loops?
  • Try the same thing with songs!
View on Code Studio

Student Instructions

Help Scrat across the slippery ice to get to the acorn!

View on Code Studio

Student Instructions

Use both and blocks to get to the acorn!

View on Code Studio

Student Instructions

Can you get to the acorn with just one move west block? Try using a loop!

View on Code Studio

Student Instructions

Add one more block to get Scrat all the way to the acorn!

View on Code Studio

Student Instructions

Can you add a loop to get to the acorn?

View on Code Studio

Student Instructions

Scrat really wants that acorn!

View on Code Studio

Student Instructions

Can you fix this code?

View on Code Studio

Student Instructions

The acorn is so far away! Can you use loops to help Scrat get there?

View on Code Studio

Student Instructions

Help Scrat get all the way over to the acorn!

View on Code Studio

Student Instructions

Help Scrat get to the acorn!

View on Code Studio

Student Instructions

Get to the acorn any way you can!

Standards Alignment

View full course alignment

CSTA K-12 Computer Science Standards (2017)

AP - Algorithms & Programming
  • 1A-AP-09 - Model the way programs store and manipulate data by using numbers or other symbols to represent information.
  • 1A-AP-10 - Develop programs with sequences and simple loops, to express ideas or address a problem.
  • 1A-AP-11 - Decompose (break down) the steps needed to solve a problem into a precise sequence of instructions.
  • 1A-AP-14 - Debug (identify and fix) errors in an algorithm or program that includes sequences and simple loops.