All data as numbers
Explain how digital systems represent all data — text, images and sound — using numbers: each pixel's colour is stored as numbers, each letter has a number code and sound is stored as a series of number samples
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All data as numbers means practising the idea at the table with a simple screen-free or sandbox check. We will demo once, then your child tries.
Materials: Paper command cards (forward, turn, repeat) OR a free visual-blocks editor preview; Pencil. 1. Say the goal of All data as numbers in plain words once. 2. Adult lines up three command cards into a short sequence that reaches a goal. 3. Child builds three short sequences (or edits one) and tests whether the goal is met. 4. Fresh check: one fresh sequence that reaches the goal. Record and stop. Done: three tested sequences with pass/fail noted. Proof: parent note of examples and results. Stop: End after the fresh check; keep optional challenge for another day.
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Learning resources
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CS Unplugged · Practice link — not the full lesson
Binary Numbers
Before you open · source notes
Binary Numbers supports All data as numbers. An adult previews and guides; this is a learning page, not a scored quiz.
Free educational page, no sign-in required for the tested path.
Before you openAsk the learner one fact they learned and one question they still have.
Opening this link does not save learning or assess mastery.
Source, access and review notes
Public CS Unplugged page. An anonymous GET on 2026-11-12 returned HTTP 200 with no login or payment prompt for this URL. Opening the link does not save practice or assess mastery. An adult should preview and guide the learner.
CS Unplugged. “Binary Numbers.” External page; Gakuva does not copy, host, embed, or redistribute materials.
Unknown — link only
Check understanding
- Colour a pixel grid from a list of numbers (e.g. 0 = white, 1 = black) to reveal a hidden picture
- Encode a short word using a number code for letters (e.g. A = 65, B = 66 in ASCII) and decode a partner's word
- Explain how a photo, a text message and a song are all stored as numbers in a device
“Does your child know that a photo on your phone is really stored as numbers — and could they turn a list of numbers into a picture on squared paper?”
Curriculum record
- Type
- Conceptual
- Subject
- Computing
- Domain
- Data Representation
- Age range
- Ages 10–12
Standards