Welcome Year 6

It’s a shame we cannot meet you to go through this lesson with you but we have to stay safe!

Read through the presentation and have a go at the worksheets if you can. Do not worry if its

too hard we will teach you how in Year 7!

Your IT and Computing Teachers are:

Mrs WentworthMr Warhurst

Buxton Community School

Objectives

Be able to recognise binary code

Be able to convert denary numbers into binary numbers

Be able to add two 8 bit binary numbers

Computers are not as smart as you think, in fact, they only know 2 things…

0 or 1

On or Off

Everything else is told to the computer by a human, this is called programming.

For a computer

0 means turn a circuit off

1 means turn a circuit on

Just like a light switch

Humans need to learn the computers language to be able to tell computers what to do.The computers language is called Binary.

Huge combinations of 1s and 0s would be too complicated for us to understand, so we need programming languages to help us to give computers instructionsthat they can execute or do.

We will learn more about that in Year 7 though.

Here is an example of what binary code looks like:

0101010001101000011010010111001100100000011010010111001100100000011001010110000101110011011110010000110100001010

The computer can only use 0s and 1s

So for a computer numbers go like is this…

Denary (our numbers)

Binary

0 0

1 1

2 10

3 11

4 100

5 101

6 110

7 111

8 1000

9 1001

10 1010

11 1011

12 1100

Remember Denary is our number system base 10 because we have 10 fingers

Remember Binary is the computers number system base 2 because the computer has only two possible states

On or off0 or 1

Nothing else!

How am I supposed to remember that?!

To make the number 5, 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

128 64 32 16 8 4 2 1

0 0 0 0 0 1 0 1

This is Binary for the number 5 because 4 + 1 = 5

So 5 for us in Denary or Base 10, is 00000101 for the computer

128 64 32 16 8 4 2 1

0 0 0 0 0 1 0 1

101

Try these on your worksheetThis PowerPoint will animate

ClickSlideshow

From current slide

248163264

00 0 1 1 0 0 1

411128

248163264

00 0 1 0 1 0 0

361128

248163264

10 0 0 0 0 0 0

161128

248163264

01 0 0 0 0 0 1

1291128

How did you do?Don’t worry if you found it hard we will learn this in

Year 7

Try these on your worksheet

Now it’s time to convert binary to OUR digits (denary)

128 64 32 16 8 4 2 1

0 1 0 0 0 0 1 0

128 64 32 16 8 4 2 1

0 0 1 0 0 1 0 1

128 64 32 16 8 4 2 1

1 0 0 0 0 0 0 1

a)

b)

c)

66

37

129

Binary additionAdding two 8 bit binary numbers

Working out how to turn a number into binary is pretty easy – yes?

Lets figure out how a computer can add numbers together.

How about 55 + 45

Well that’s 100, right?

Lets see

248163264

10 0 1 0 1 1 1

551128

248163264

00 0 1 1 1 0 11128

45

There are 4 rules

Rules

Computers only understand 1 and 0 remember!

The number 2 does not exist to a computer, neither does any other number

Only 1 or 0

So when we add 1 and zeros we can only ever get to 1 or 0

Hmm

Do not worry it is easy

• Rule 1 0 + 0 = 0

• Rule 2 0 + 1 = 1

• Rule 3 1 + 1 = 0 carry 1

• Rule 4 1 + 1 + carry 1 = 1 carry 1

00

0

011

11

0

111

1

1

1

Ok lets add two 8 bit numbers

248163264

10 0 1 0 1 1 1

55 + 451128

00 0 1 1 1 0 1

00 1 1 0 1 0 0111111

55

45

100

Try task 1 to 3

PlenaryUse your Exit Ticket to write down 2 things you

have learnt this lesson.

Exit Ticket:__________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________