3_3_1 Number Bases

You should be able to:

Understand the following number bases:

•• decimal (base 10)

•• binary (base 2)

•• hexadecimal (base 16)

Understand that computers use binary to represent all data and instructions.
Explain why hexadecimal is often used in computer science.

REVISE:

Decimal and Binary

Decimal (Denary) and Binary already been covered in:

7_2_10

Re-visit these outcomes as part of your revision.

Hexadecimal

Hexadecimal.pdf

Why Hexadecimal?

Hexadecimal has these advantages:

It is easier to read
It is easier to remember
1 byte (8 0's and 1's) can be written with just 2 digits

Hexadecimal IS NOT:

Data compression! Just because it uses less digits, it doesn't mean it takes up less space! F in hex is still using up the same amount of data storage as 1111 in binary.

TEST:

Download and print the test paper here: https://drive.google.com/open?id=0B5fLtQ0Xgr2POW1QWGlZd1hoM3c
Try the mock test yourself.
Use the 3.3.1 Walking Talking Mock below to guide you through answering the questions.

SOURCE RECOGNITION - PLEASE NOTE: The examination examples used in these walking talking mocks are samples from AQA from their non-confidential section of the public site. They also contain questions designed by TeachIT for AQA as part of the publicly available lesson materials.

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