🎯 What you will learn
- An “if” helps the computer choose
- If something is true, do one thing
- Otherwise (else), do another
👋 Let’s get started!
IF it is raining, THEN take an umbrella ☂️. Otherwise, wear sunglasses 😎. You make choices like this all day! Computers can make choices too, using IF.
🪜 Step by step
1. ❓ Ask a question
An if starts with a question that is yes or no: Is it raining? Is the light red?
2. ✅ If yes…
If the answer is yes, the computer does the THEN steps.
3. ❎ Else…
If the answer is no, the computer does the ELSE steps instead.
🧪 Try it!
Read the code, guess what it prints, then press 👀 Show output.
Robo crosses the street
if light is 🔴:
🛑 stop
else:
🚶 walk🎨 Unplugged activity
🚦 Play Red Light, Green Light! IF the light is red, freeze. ELSE, walk. You are running an if program with your body!
Get dressed for the weather
look outside 👀
if it is cold:
🧥 wear a coat
else:
👕 wear a t-shirt📖 Key words
Tap a card to flip it over!
- If
- Checks if something is true ❓
- Then
- What to do if it’s true ✅
- Else
- What to do if it’s not true ❎
Knowledge Check Quiz
- IF it is night, THEN…
- What does “else” mean?
- Can computers make choices with if?