GCSE Computer Science: Data lesson 3 (Binary addition and negative numbers)

Full lesson - Introduction to representing negative numbers in binary. This lesson recaps binary representation and then introduces negative numbers. To aid understanding of two’s complement, binary addition is also covered. Both sign and magnitude and two’s complement are covered, with worked examples, exercises, and an explanation of the problems with sign and magnitude notation. Includes teacher’s PowerPoint, activities, and homework (with solutions). Fully editable resource.

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  • 3a.-Binary-negatives.pptx
  • 3b.-Sign-and-magnitude.docx
  • 3c.-Sign-and-magnitude-(answers).docx
  • 3d.-Twos-complement.docx
  • 3e.-Twos-complement-(answers).docx
  • 3f.-Homework.docx
  • 3g.-Homework-(Answers).docx

About this resource


Created: Dec 10, 2018

Updated: May 2, 2019

Whole lesson

pptx, 437 KB



docx, 97 KB



docx, 117 KB


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