Text Encoding (ASCII & Unicode)
👩🏫 Teacher’s Guide
Objective
Students will explain that computers store text as numbers using encoding systems like ASCII and Unicode and recognize why Unicode supports many languages.
Teaching Notes
- Explain encoding as a code that matches characters to numbers.
- Use a simple example: letters can be represented by numbers.
- Compare ASCII (older, fewer characters) vs Unicode (many languages and emojis).
- Keep it high-level; no need to memorize specific codes.
🧒 Student Worksheet
Concept and Helping Material
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Computers store letters and symbols as numbers. Text encoding is a system that matches each character to a number. ASCII is an older system with fewer characters, and Unicode supports many languages and emojis.
Computer Vocabulary and Definition
- — A system that changes text into numbers.
- — A letter, number, symbol, or emoji.
- — An older text code with fewer characters.
- — A text code that supports many languages and symbols.
- — A small picture character like 😀.
Computer QA
- What is encoding?
- What is a character?
- What is ASCII?
- What is Unicode?
- What is an emoji?
- True or False: Computers store text as pictures only.
- True or False: Computers store text as numbers.
- Why do we need text encoding?
- Which supports more languages: ASCII or Unicode?
- Can Unicode include emojis?
- Is ‘A’ a character?
- Is ‘7’ a character?
- Is ‘!’ a character?
- Can Unicode represent Chinese or Arabic letters?
- Why is Unicode useful today?
- Does ASCII work for every language?
- What happens if text is not encoded correctly?
- True or False: Encoding helps computers send text messages.
- What is one place you see Unicode?
- What is one reason encoding matters?
Computer Prtactices
- Character hunt: Circle characters in a sentence (letters, numbers, symbols).
- Emoji talk: List 5 emojis and explain what they mean.
- ASCII vs Unicode chart: Write 2 features of each in simple words.
- Message experiment: Write your name and add one emoji to show Unicode symbols.
Reflection
- Why is Unicode helpful?
- What is one kind of character besides letters?