ZIMSEC O-Level Computer Science
6.3Data Representation
Data Representation in ZIMSEC O-Level Computer Science: what the syllabus expects you to know, the learning objectives and how to practise.
Topic207 practice questions11 lessons
In this topic
Lessons
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Number systems: why computers use binary
25 min
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Binary addition and overflow
30 min
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Binary subtraction with borrowing
30 min
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Converting between binary and denary
30 min
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Representing text: ASCII and Unicode
30 min
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Hexadecimal: conversions and uses
35 min
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Octal: the base 8 number system
30 min
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Units of data storage
25 min
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Designing logic circuits and writing logic expressions
40 min
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Logic gates: NOT, AND, OR, NAND, NOR and XOR
30 min
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Truth tables for logic circuits and expressions
35 min
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Sample question
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