Computer Science

a digit's value based on its position in a number

number system using digits 0-9, where each place value is a power of ten

number system using only the digits 0 and 1, where each place value is a power of two

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

Number bases

Why do computers use binary?

Binary addition

Binary subtraction

Binary shifts

Hexadecimal

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 base of the binary number system?

What is a digit’s value based on its position in a number known as?

What is the decimal value of the binary number 1101?

What is the binary representation of the decimal number 10?

a number system with 0 to 9, where each place value is a power of ten

a number system with 0 and 1, where each place value is a power of two

Match the term to the correct description.

raw facts, such as numbers or text, presented without meaning

What does the term 'data' mean in computing?

a way to convert decimal numbers into binary

a tiny electronic switch controlled by electricity

In a binary system, if on is represented by 1, what represents off?

because binary is easy for humans to understand

because binary can be represented by two-state electrical signals

because binary numbers are always smaller than decimal numbers

because binary uses more digits than decimal

Why do computers use binary to represent data?

What is the highest-value digit in binary?

raw facts, such as numbers or text, presented without any meaning

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

directions on how to carry out a specific task

Match the words to their correct description.

Number bases

Lesson outcome