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GCSE Computer Science · key term
A base-10 number system using the digits 0–9, with place values such as 1, 10 and 100.
Used by OCR
Paper 1
Revise: Denary and Binary ConversionDenary is the familiar base-10 number system. It uses ten digits, 0–9. A digit's position determines its value: in denary 45, the 4 represents four tens and the 5 represents five ones.
The base-10 number system, using digits 0–9. Its place values are ones, tens, hundreds and so on.
When converting denary to binary, use a 1 if the remaining value is greater than or equal to the column heading. Equality matters: denary 64 is 01000000.
Check your answer by converting it back. A binary number ending in 1 represents an odd denary number; one ending in 0 represents an even number.
For denary to hexadecimal, use the whole-number quotient and remainder, not the decimal part of a division.
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