Warm Up (10 min)

Introduction

In this lesson, students will be creating loops that only run until a condition is true. Help the students understand how this works by leading them in group activities and having them do an action until some condition is true. For example: Have students touch their nose until you tell them to stop.

Bridging Activity (15 min)

This activity will help bring the unplugged concepts from "Conditionals With Cards" into the online world that the students are continuing to move into. It will also help bridge the concept of conditionals to repeat until loops. Choose one of the following to do with your class:

Unplugged Activity Using Paper Blocks

Print and cut out 2-3 repeat until loops and some blank action blocks from Unplugged Blocks (Courses C-F) - Manipulatives. Pull out a deck of cards. Ask the class to come up with a couple of conditionals to use with the deck of cards like they did in "Conditionals with Cards." When the conditionals have been decided on as a class, fill in the blank part of the repeat until loop with the various card groups that the kids came up with. Examples include "Even Numbered", "Red card", or "Diamonds". Fill in the action blocks with the actions the students came up with. Make sure the students know the action blocks need to be directly inside the repeat until block. Line the blocks up sequentially so students can see how it runs as a program. Below is a example.

Now shuffle the deck of cards and play "Conditionals with Cards" again. Flip through the deck card-by-card, reacting to cards if a conditional has been made for it. Make sure students know that once you have left the until loop, you continue moving forward and do not return to the previous loop just because the conditions match again.

Preview of Online Puzzles

Pull up a puzzle from Lesson 15 at CSF Express Course 2018 - Website. We recommend Puzzle 4.

• Ask the class what the bird should repeat to get to the pig.
  • The bird should repeat move forward, turn right, move forward, and then turn left.
• Ask the class what they can use to repeat this code.
  • The bird should repeat this pattern until it reaches the pig.

Fill in the rest of the code using the repeat until loop and press Run. Discuss with the class why this worked.

Main Activity (30 min)

CSF Express Course 2018 - Website

Bringing together concepts is not easy, but this set of lessons is meant to help students see the endless possibilities of coding when using conditions. If students struggle at all with understanding the similarities or differences between while loops and until loops, have them try to think of how they would use similar statements in their real lives.

Wrap Up (15 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?
• How do you feel about today's lesson?
• What's the difference between an until loop and a while loop?

Extended Learning

Until Simon Says

Go out to a large playing field and have the students stand in a line facing you. Make sure every student can see you. Declare a couple of "until loops" such as:

• Until my right hand is raised up, you can walk toward me
• Until I say "eggplant", you can walk backwards in my direction
• Until I turn my head to the right, you have to walk like a crab

The first student to get to you wins. If there's time, let other students be "Simon" at the front of the class.