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SingaporeComputer ScienceQuick questions
Data Representation
Quick questions on Number systems, binary and hex explained: O-Level Computing
5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is place value in binary?Show answer
Binary uses positional place value, exactly like denary, but each column is a power of two instead of a power of ten:
What is place value in hexadecimal?Show answer
Hexadecimal uses base 16, so each column is a power of sixteen, and it needs sixteen digits. The digits run to and then for the values ten to fifteen:
What is q1?Show answer
State what a bit and a byte are, and how they are related. [2 marks]
What is q2?Show answer
Give the denary value of . [2 marks]
What is q3?Show answer
Explain why one hexadecimal digit can represent any 4-bit binary value. [2 marks]
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