CS01-02 Computer Science Watch
Denary to binary and back
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In this lesson
In this video you'll learn about denary to binary and back for GCSE Computer Science.
By the end: Convert between denary and 8-bit binary in both directions for values 0 to 255, and work out how many different values a given number of bits can represent.
What it covers
- 0:54 Denary to binary and back
- 3:24 Binary to denary, 11010110
- 4:53 Denary to binary, 173
- 6:52 Your turn: leading zeros, convert 9
- 8:33 How many values
- 10:29 Exam technique
Key words
For: AQA GCSE 8525, Edexcel GCSE 1CP2, OCR GCSE J277
On the specification
| Board | Spec | Statement |
|---|---|---|
| AQA GCSE 8525 | 3.3.2 | Converting between number bases |
| Edexcel GCSE 1CP2 | 2.1.1 | Binary |
| Edexcel GCSE 1CP2 | 2.1.3 | Convert between denary and 8-bit binary, for unsigned 0 to 255 and signed -128 to +127. |
| OCR GCSE J277 | 1.2.4 | Data storage - Numbers |
For teachers
This GCSE Computer Science lesson teaches denary to binary and back. By the end, students should be able to convert between denary and 8-bit binary in both directions for values 0 to 255, and work out how many different values a given number of bits can represent. It works through four worked examples and the mistakes examiners report.