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🧪 Interactive Lesson · Computer Science · O Level
Binary, Decimal and Hexadecimal Conversions
Practise conversions one step at a time. Fill in each step, press Check, and you'll be told straight away what is right, what is wrong and why.
Keep these in mind
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- Place values: from the right, binary places are worth 1, 2, 4, 8, 16, 32, 64, 128. Each one is double the place on its right.
- Decimal → binary: keep dividing by 2 and write down each remainder. Then read the remainders from the bottom up.
- Binary → decimal: add up the place values that have a 1 under them.
- Hexadecimal digits go 0–9, then A = 10, B = 11, C = 12, D = 13, E = 14, F = 15. One hex digit is exactly 4 bits, worth 8, 4, 2, 1.
Keep practising
Reinforce number systems with exam-style questions in the Computer Science workbooks.