A micro-controller stores a sensor reading as an 8-bit unsigned binary integer with the value 1101 0100.
Explain why it is not possible to store the negative denary equivalent of this reading as an 8-bit signed two's complement binary number.
117 exam-style questions on Edexcel GCSE Computer Science Binary, covering Binary representation and number of states, Unsigned and two's complement integers, Converting denary and 8-bit binary, Binary addition and binary shifts, Concept of overflow, and Hexadecimal notation and conversion. Each one has a worked solution and a mark scheme showing where the marks go.