ComputingYears 7–9Computer Science

Binary and data representation

Learn Binary and data representation for Years 7–9 pupils (ages 11–14). Free practice questions, lessons and worked examples — aligned to the UK National Curriculum.

What you'll learn

  1. 1

    Computers store everything in binary — only 0 and 1 — because a circuit is either off or on.

  2. 2

    Binary place values double: 128, 64, 32, 16, 8, 4, 2, 1. So 00001101 is 8 + 4 + 1 = 13.

  3. 3

    What is binary 1010 in denary?

  4. 4

    Text is stored as numbers too. Character sets like ASCII and Unicode give each character a code — capital A is 65.

  5. 5

    A larger image file usually means more pixels or more bits per pixel. Both increase quality and file size together.

  6. 6

    How many bits are in a byte?

  7. 7

    What is the difference between lossy and lossless compression?

Practise Binary and data representation with Whizlo

Free AI-tutored lessons, unlimited practice questions, and progress tracking for ages 11–14. Aligned to the UK National Curriculum.

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