**AN INTRODUCTION TO BINARY.**

**By James Holmes**

**@JholmesICT**

Wessex Computing Project

Wessex Computing Project

**Can computers talk?**

Computers are not like us, they cannot talk with words. They can only use 1's and 0's.

**0 = Off**

1 = On

1 = On

This system is called 'Binary'

How do we count?

We use a 'base 10' counting sequence.

(10 digits)

Because we

have 10 fingers!

We use the digits

0 - 9

We use columns!

10

0

10

1

10

2

10

3

**U**

**T**

**H**

**Th**

3

2

6

8

Revision

Let's revise the way that

we use numbers...

How do computers count?

Computers use a 'base 2' counting system.

(2 digits)

Because they only understand

'On' or 'Off'!

They use the digits

0 - 1

Binary uses columns!

**1**

**2**

**4**

**8**

1

2

2

2

3

2

3

2

0

1

0

0

What number is this?

What number is this?

Can you read Binary?

1

2

4

8

2

0

2

1

2

2

2

3

What are these Binary values?

1. 0010

2. 1001

3. 0101

4. 1100

5. 0111

The value of each column doubles.

The value of each column multiplies by 10.