Computer Science

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

Hexadecimal

Why do computers use binary?

Number bases

Binary addition

Binary subtraction

Binary shifts

Hexadecimal number conversions

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 name of the base-16 number system?

What value is missing from these hexadecimal values? 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F

a base-16 numbering system that uses the values 0 to 9 and A to F

a base-2 numbering system that uses the digits 0 and 1

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

Match these number bases with their correct definition: 

It's easier for humans to read and interpret.

Why do humans use hexadecimal instead of binary?

Which of the following is NOT a value used in hexadecimal?

What is the hexadecimal equivalent of the binary number 1010?

What is the binary number system based on?

Which number system uses the digits 0 to 9?

What is the name of the electronic switch used in computing?

In ascending order, give the results of the rules of binary addition: ﻿0 + 0, 0 + 1, 1 + 1, 1 + 1 + 1.

It multiplies the number by a power of 2.

What happens when you shift a binary number to the left?

In binary, what is 110 multiplied by 1000?

Hexadecimal

Lesson outcome