ChalkHour

Year 8 Computer Science: Binary numbers lesson pack

A complete, ready-to-teach KS3 lesson on binary numbers. Below is a real sample of what ChalkHour makes: the full pack adds three levels of worksheet, model answers, a teaching explainer and print-ready PDF and Word files.

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Real sample

Introduction to Binary Representation

This lesson introduces Year 8 students to the binary number system (Base-2). Students will learn why computers use binary, how to calculate the value of an 8-bit binary number, and how to convert standard denary numbers into binary code.

Learning objectives

  • Explain why computers use binary to represent data.
  • Convert 8-bit binary numbers into denary (base-10) integers.
  • Convert denary integers up to 255 into 8-bit binary numbers.

Lesson plan (60 minutes)

  1. Introduction · 10 min

    Starter: Discussion on how computers 'think'. Introduction to the concept of switches (on/off).

  2. Direct Instruction · 15 min

    Teacher-led explanation: How to read binary place values and the 8-bit grid. Guided practice using the worked example.

  3. Independent Practice · 20 min

    Main Activity: Students work through differentiated worksheets (Support, Core, or Stretch) based on prior confidence.

  4. Review · 10 min

    Binary Bingo or Peer Marking: Reviewing worksheet answers to ensure understanding.

  5. Assessment · 5 min

    Plenary: 8-question Multiple Choice Quiz to check for progress against objectives.

Key vocabulary

Binary
Base-2 number system using only 0 and 1.
Denary
Base-10 number system using 0-9 (the system humans use).
Bit
Short for 'Binary Digit'. A single 0 or 1.
Byte
A group of 8 bits.
Transistor
An electronic component that acts as a switch.

Core worksheet (first questions)

  1. Convert the binary number 00001111 to denary.
  2. Convert the binary number 00101010 to denary.
  3. What is the value of the 'Most Significant Bit' (the bit furthest to the left) in a byte?
  4. Convert the denary number 60 into 8-bit binary.

Quiz (sample)

  1. 1. What 'Base' is the binary system?

    • A. Base-10
    • B. Base-2
    • C. Base-16
    • D. Base-8

  2. 2. What is a 'bit' short for?

    • A. A group of 8 numbers
    • B. A type of computer chip
    • C. A single 0 or 1
    • D. The number 2

  3. 3. How many bits are in a byte?

    • A. 4
    • B. 10
    • C. 8
    • D. 16

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