Binary on and off
Explore how digital systems represent data using two states — on and off, written as 1 and 0 — called bits, and use binary numbers to represent whole numbers and letters
Lesson
Set out your lesson
“Binary on and off means practising the idea at the table with a simple screen-free or sandbox check. We will demo once, then your child tries.”
Bring to the table
- Device photo cards or a labeled computer sketch
- Sticky notes for part names
Extra for the adult
Worked example. The keyboard is an input — it sends letters into the computer.
Optional challenge. For Binary on and off, add one harder example after success.
What to notice. Keep one parent note: examples tried; results; support used. This session samples Binary on and off, not mastery.
Share and support
Family records and proof options
Keep a record of your learning
Save photos, notes, and attendance. Export a proof packet for compliance or portfolio reviews.
Practice this concept
Start practiceBinary on and off practice
Practice key ideas from Binary on and off.
Free · no login · no ads · Practice answers and completion are not saved. Parent observation remains the lesson record.
Learning resources
Extra practice links — they do not replace Gakuva’s teaching approach.
CS Unplugged · Practice link — not the full lesson
Binary Numbers
Before you open · source notes
Binary Numbers supports Binary on and off. 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
- Show every number from 0 to 31 using five binary cards (16, 8, 4, 2, 1) turned face up for 1 and face down for 0
- Convert binary numbers such as 1010 and 10011 to ordinary numbers and back
- Explain why computers use two states (a switch, light or current is either on or off) and show a letter as a string of bits using a given code
“Playing with 'binary cards' or light switches, could your child show how on and off (1 and 0) can make any number — like making 5 with 101?”
Curriculum record
- Type
- Conceptual
- Subject
- Computing
- Domain
- Data Representation
- Age range
- Ages 10–12
Standards