Computer Science Binary and Data Representation Worksheet (KS3 / GCSE)

This worksheet introduces students to binary and data representation, building a clear foundation in how computers store and process data using 0s and 1s. Concepts are explained step by step using simple language, worked examples, and structured practice tasks.

Students learn:
• What binary is and why computers use it
• The difference between a bit and a byte
• How to convert binary to decimal using the place value method
• How text is represented using ASCII
• How to convert letters into ASCII values and binary
• How to explain binary concepts in full written answers

This includes:
• Clear explanations of binary and ASCII
• Guided examples of binary to decimal conversion
• Practice tasks converting binary numbers
• ASCII table reading and interpretation
• Tasks converting letters to ASCII and binary
• Extended short-answer questions to evidence understanding
• Teachers mark scheme document with guidance

Suitable for:
• KS3 Computing
• GCSE Computer Science foundations
• Classwork, homework, or cover lessons
• Introducing or reinforcing binary and data representation

This resource is designed to support conceptual understanding, not just exam technique, and works well alongside programming or theory lessons.