1. Binary

2. Learning Outcomes
Lo1: Recognise Binary Code LO2: Describe how to convert it LO3: Convert numbers in binary

3. Starter
Video: James May explains binary

4. Binary
Computers know two things 0 and 1, this is how they work. We program a computer to do things this is us communicating with the computer. There are lots of circuits in a computer and these must be told to be on or off. The computer understands this by: 0 means OFF 1 means ON

5. The computers language is Binary.
We need to know the computers language sow e can control it
The computers language is Binary.
Binary looks like this:

6. The computer can only use 0s and 1s So for a computer numbers look like this:
Denary (our numbers)
Binary 1 2 10 3 11 4
100 5
101 6
110 7
111 8
1000 9
1001
1010
1011 12
1100

7. Denary numbers (our numbers) – keep doubling!
How do we do this?
Denary numbers (our numbers) – keep doubling!
Make a table like this..
128 64 32 16 8 4 2 1
To make the number 9, place a 1 under the numbers that you need and a 0 under the numbers that you don’t…
128 64 32 16 8 4 2 1
This is Binary

8. So 9 for us, is 00001001 for the computer
128 64 32 16 8 4 2 1
We can forget the first few 0s and our binary number 9 looks like this…
1001

9. Use your table to convert these numbers to binary:3 2 6 10 17 20 42 47 71
146
255

10. Answers 3 2 6 10 17 20 42 47 71
146
255 11 10
110
1010
10001
10100
101010
101111

11. Is there any number that cant be converted?
Task 2
In pairs, give your partner a number under 255 and see if they can convert it into binary.
Is there any number that cant be converted?

12. Plenary
Two stars and a wish