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ECHNICAL
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UNDAMENTALS FOR
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Pearson BTEC International Level 3 Qualifications in Information Technology –
Specification – Issue 3 – September 2022 © Pearson Education Limited 2022
321
Content
Learning aim A: Explore the mathematics, logic and processes of computer
systems
A1 Number systems
The use and application of mathematical principles and number systems within
computing systems.
•
Number systems used in computer systems, including:
o
units and scales of digital data (bit, byte, kilobyte, megabyte)
o
binary
o
hexadecimal.
•
Why computers use binary and how it is used to represent all data, e.g. number,
characters, image sound.
•
Mathematical operations performed on denary, binary and hexadecimal
number systems, including:
o
conversion of numbers between number systems
o
performing addition, subtraction, division and multiplication (including binary
shifts)
o
use of binary to represent negative and floating-point numbers
o
the concept of overflow errors
o
relationship between binary and file size
o
calculation of files sizes for sound, text and images.
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