Computer Science

a base-16 number system that uses the digits 0 to 9 and the letters A, B, C, D, E and F

a base-10 number system that uses the digits 0 to 9

a number system that uses the digits 0 and 1 to represent data

Hexadecimal number conversions

Why do computers use binary?

Number bases

Binary addition

Binary subtraction

Binary shifts

Hexadecimal

In this unit pupils will be reminded of how the base-10 number system works before being introduced to the base-2 number system. They will perform conversions between binary and decimal and recognise the rules of binary addition and subtraction. They will be introduced to hexadecimal and its uses.

Representation of numbers

What is the hexadecimal number F5 in decimal?

What is the hexadecimal number 6C in decimal?

Match the decimal number to its hexadecimal equivalent. 

The binary number 10011001 is {{}} in hexadecimal.

The hexadecimal value F1 is equal to which binary value? 

The hexadecimal value BD is equal to the binary value {{}}.

Match the base value to the correct number system.

Which of the following is not a hexadecimal digit?

{{}} numbers are often used to represent colour codes. 

What letter represents the decimal value 14 in hexadecimal?

The hexadecimal value C is equivalent to the binary value {{}}.

Web developers use hexadecimal values to represent colours, like #FF6600.

Hexadecimal is easier for humans to read and write compared to binary.

Hexadecimal shortens binary numbers for easier reading.

Hexadecimal number conversions

Lesson outcome