It is important that you can describe and use the binary number system and the hexadecimal notation as shorthand for binary number patterns. 

Number systems - Number bases

Computers operate with electronic circuits using transistors as switches, which are either 'on' A number base is the number of digits or combinations of digits that a system uses to represent numbers.

• Binary (base 2) numbers

• Denary (base 10) numbers

• Hexadecimal (base 16) numbers) 0, 1, 2, 3, 4, 5, 6, 7 ,8, 9 , 10, 1

Truncation & Rounding