Numbers

What you need to know:

Representation of Numbers

Convert between denary, binary and hexadecimal
Use arithmetic shift functions and their effect
Use binary addition and explain overflow

Topic 4 covers all aspects of storing data in a computer, whether it's text in a Word document, an image, a video file, sound, or numbers for calculation.

Numbers

Number have to be stored and used by computers but computer only understand and use 0 or 1. Humans use denary 0-9, computer binary 0-1. Every number has a binary value. You have to work them out.

1 bit store - 0 or 1
4 bits - 0000 (Nybble)
8 bits - 01010101 (Byte)

Make sure you can convert between Denary - Binary (8 bits) - Hexadecimal (16 bits)

Why do we need to know about binary?

Binary to denary conversion

This computer science video is about the binary number system which is fundamental to the operation of a digital electronic computer. It covers the need for binary and details of how to convert positive whole numbers in base 10 into 8 bit binary, and vice versa.