# Lesson 15: Harvesting with Conditionals

## Overview

Students will practice while loops, until loops, and if / else statements. All of these blocks use conditionals. By practicing all three, students will learn to write complex and flexible code.

## Purpose

Practicing the use of conditionals in different scenarios helps to develop a student's understanding of what conditionals can do. In the previous lesson, students only used conditionals to move around a maze. In this lesson, students will use conditionals to help the farmer know when to harvest crops. New patterns will emerge and students will use creativity and logical thinking to determine the conditions where code should be run and repeated.

## Objectives

### Students will be able to:

• Nest conditionals to analyze multiple value conditions using if, else if, else logic.
• Pair a loop and conditional statement together.

## Preparation

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

## Vocabulary

• Condition - A statement that a program checks to see if it is true or false. If true, an action is taken. Otherwise, the action is ignored.
• Conditionals - Statements that only run under certain conditions.
• Loop - The action of doing something over and over again.
• Repeat - Do something again
• While Loop - A loop that continues to repeat while a condition is true.

# Teaching Guide

## Warm Up (5 min)

### Introduction

Students shouldn't need as much of an introduction to concepts today because they have had practice with them in the previous lesson. Instead, you can share the story of the harvester.

The harvester is trying to pick crops like pumpkins, lettuce, and corn. However, the farmer has forgotten where she planted these crops, so she needs to check each plant before harvesting.

## Main Activity (30 min)

### Course D Online Puzzles 2018 - Website

Students will continue to work with if / else statements, while loops, and until loops. These puzzles are a bit more challenging, though, so encourage students to stick with them until they can describe what needs to happen for each program.

## 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?
• How can you see conditionals being useful in programs?
• What if people only spoke in if/else statements? What would be some advantages and disadvantages of this?
View on Code Studio

### Student Instructions

"Corn you help me harvest today?"

Use conditionals to make sure that you pick all of the corn, but don't disturb the stalks where nothing is growing yet.

View on Code Studio

### Student Instructions

"Lettuce collect both crops from this row!"

Help the farmer collect both corn and lettuce from the field.

View on Code Studio

### Student Instructions

View on Code Studio

### Student Instructions

"Gosh! Now the crops are growing in clusters!"

Help the farmer pick all of the lettuce in each cluster before moving on to the next bunch.

View on Code Studio

### Student Instructions

"What a bountiful crop!"

This field has clusters of corn, lettuce, and pumpkins all growing together. Can you collect them all?

View on Code Studio

### Student Instructions

"Let's take this one step further!"

Can you figure out how to pick the pumpkin? Make sure to collect all of the corn along the way!

View on Code Studio

### Student Instructions

Challenge: Collect all of the corn and lettuce, then pick the pumpkin.

View on Code Studio

### Student Instructions

Collect all of the corn and lettuce, then pick the pumpkin.

View on Code Studio

### Student Instructions

Collect all of the corn and lettuce, then pick the pumpkin.

View on Code Studio

### Student Instructions

Collect all of the corn and lettuce, then pick the pumpkin.

Take a close look at the code below. What will happen after you click "Run"?

The farmer will collect all of the produce.

The farmer will not collect any of the produce with the path she is taking.

The farmer will collect all of the produce, except the pumpkin.

I don't know.

## Standards Alignment

#### CSTA K-12 Computer Science Standards

AP - Algorithms & Programming
• 1B-AP-11 - Decompose (break down) problems into smaller, manageable subproblems to facilitate the program development process.

## Cross-curricular Opportunities

This list represents opportunities in this lesson to support standards in other content areas.

#### Common Core English Language Arts Standards

L - Language
• 3.L.6 - Acquire and use accurately grade-appropriate conversational, general academic, and domain-specific words and phrases, including those that signal spatial and temporal relationships (e.g., After dinner that night we went looking for them).
SL - Speaking & Listening
• 3.SL.1 - Engage effectively in a range of collaborative discussions (one-on-one, in groups, and teacher-led) with diverse partners on grade 3 topics and texts, building on others’ ideas and expressing their own clearly.
• 3.SL.3 - Ask and answer questions about information from a speaker, offering appropriate elaboration and detail.
• 3.SL.6 - Speak in complete sentences when appropriate to task and situation in order to provide requested detail or clarification.

#### Common Core Math Standards

MP - Math Practices
• MP.1 - Make sense of problems and persevere in solving them
• MP.2 - Reason abstractly and quantitatively
• MP.4 - Model with mathematics
• MP.5 - Use appropriate tools strategically
• MP.6 - Attend to precision
• MP.7 - Look for and make use of structure
• MP.8 - Look for and express regularity in repeated reasoning
OA - Operations And Algebraic Thinking
• 3.OA.3 - Use multiplication and division within 100 to solve word problems in situations involving equal groups, arrays, and measurement quantities, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem.1

#### Next Generation Science Standards

ETS - Engineering in the Sciences
ETS1 - Engineering Design
• 3-5-ETS1-2 - Generate and compare multiple possible solutions to a problem based on how well each is likely to meet the criteria and constraints of the problem.