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Codes and Secret Messages
Encode and decode messages using simple substitution codes.
⏱ 16 min❓ 6 questions
What you'll be able to do
- ✔I can encode a message with a code
- ✔I can decode a message
- ✔I can explain why codes need a key
How this works
- 1Read the short explanations first — they teach you what you need before each question.
- 2Answer each question, then tap Check. A right answer moves you on automatically; if it's wrong, you'll see a friendly explanation of why.
- 3Finish all 3 steps to see your score — sign in and subscribe to unlock the full lesson and save it.
What's inside
6 questions and 1 quick teaching card, including:
- 🔘Multiple choice — Tap the answer you think is best, then check it.
- ✏️Fill in the blank — Type the missing word to complete the sentence.
👪Grown-up tip: sit alongside younger learners for the first few lessons. Read the questions together and chat about the explanations — that's where the real learning sticks.
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Curriculum: AC9TDI6K02, AC9TDI6P02