1. 1
1. Binary Basics
Year 8 Unit 1
Bitmap Graphics

2. Homework Subject Homework Date
Computing
Review 1. Binary Basics
and practice counting to 15 in binary with your hand.

3. 1 2 3 4 Today’s Aims See why we use binary numbers
Learn about bits & bytes 3
Understand how binary bytes can be used to represent numbers
Please start lesson by going through objectives to establish context 4
See to convert binary numbers

4. What is binary? These are binary numbers They only use 1s and 0s
Amazingly, all digital devices like our phones and PCs handle data such as text and images using binary numbers.

6. = off 1 = on Why we use binary
We use binary to represent what happens in the electric circuits of computer chips
The electric signals are either on or off =
off 1 = on

7. 1 = On
0 = Off

8. Details filled in
Computing
Fred Bloggs 8E
Mrs Smith
IT5
9a4

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10. We’ll make these notes
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11. 1. Binary Basics
7 Sept.
Amazingly, all digital devices like PCs and phones handle data such as text and images using binary numbers.
Binary uses just two digits to represent computer chip circuits where electric signals are either on or off:
off = 1 = on

12. off = 1 = on
Each single 1 or 0 is called a bit. But you can’t do much with just one bit!
So we put eight bits together to make a byte.

13. Bits & Bytes
These are our basic ‘units’ for binary
byte 1 1 1
bit

14. Converting Binary Numbers
We use place values 4s 2s 1s 1 1 1

15. 6 3 2 x10 x10 100s 10s 1s Using Decimal Numbers
You’ve always used place values
x10
x10
100s
10s 1s 6 3 2

16. Converting Binary Numbers
We use place values x2 x2 x2 x2 x2 x2 x2
128s
64s
32s
16s 8s 4s 2s 1s 1 1 1 = ? 42 32 8 2  

17. So we put eight bits together to make a byte.
We use place values to convert binary bytes to decimal numbers like this:
X 2
128 64 32 16 8 4 2 1 1 42 = 32 + 8 + 2

18. Well done”
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19. 1 2 3 4 Today’s Aims See why we use binary numbers
Learn about bits & bytes 3
Understand how binary bytes can be used to represent numbers
Please start lesson by going through objectives to establish context 4
See to convert binary numbers

20. 2 1
= 2 2
Did you
Forget me?!

21. 0 = 1 = 1 2 = 1 3 = 1 1 4 = 1 5 = 1 1 Counting 8s 4s 2s 1s Binary
For a start, let’s count from to in binary…
1 = 1
2 = 1
3 = 1 1
4 = 1
5 = 1 1

22. Counting 8s 4s 2s 1s Binary Now let’s count using your fingers!
Each finger has its own ‘place value’

23. 1 1 1 1 Counting 8s 4s 2s 1s Binary ‘Up’ fingers represent a ‘1’
So what’s the highest value you can get?

24. 0 = Counting 8s 4s 2s 1s Binary These ‘down’ fingers are all 0s
These ‘down’ fingers are all 0s 2 4 1 8
So now, let’s try to count to 8 on fingers

25. 1 = 1 8s 4s 2s 1s Binary Counting Remember:1
Remember:
Each finger has a place value 2 4 1 8
Up =1
and
down = 0

26. 2 = 1 8s 4s 2s 1s Binary Counting Remember:1
Remember:
Each finger has a place value 2 4 1 8
Up =1
and
down = 0

27. 3 = 1 1 8s 4s 2s 1s Binary Counting Remember:1 1
Remember:
Each finger has a place value 2 4 1 8
Up =1
and
down = 0

28. 4 = 1 Counting 8s 4s 2s 1s Binary Remember:1
Remember:
Each finger has a place value 2 4 1 8
Up =1
and
down = 0

29. 5 = 1 1 8s 4s 2s 1s Binary Counting Remember:1 1
Remember:
Each finger has a place value 2 4 1 8
Up =1
and
down = 0

30. 6= 1 1 1s Binary Counting 8s 4s 2s Remember:1 1
Remember:
Each finger has a place value 2 4 1 8
Up =1
and
down = 0

31. 7 = 1 1 1 8s 4s 2s 1s Binary Counting Remember:1 1 1
Remember:
Each finger has a place value 2 4 1 8
Up =1
and
down = 0

32. 8 = 1 8s 4s 2s 1s Binary Counting Remember:
Remember:
Each finger has a place value 2 4 1 8
Up =1
and
down = 0

33. 9 = 1 1 8s 4s 2s 1s Binary Counting Now continue on your own…1
Now continue on your own… 2 4 1 8
See if you can count all the way to 15…

34. 8s 4s 2s 1s
Binary
Counting
10 = 1 1 2 4 1 8

35. 8s 4s 2s 1s
Binary
Counting
11 = 1 1 1 2 4 1 8

36. 8s 4s 2s 1s
Binary
Counting
12 = 1 1 2 4 1 8

37. 8s 4s 2s 1s
Binary
Counting
13 = 1 1 1 2 4 1 8

38. 8s 4s 2s 1s
Binary
Counting
14 = 1 1 1 2 4 1 8

39. Counting 8s 4s 2s 1s
Binary
15 = 1 1 1 1 2 4 1 8

40. Homework Subject Homework Date
Computing
Review 1. Binary Basics
and practice counting to 15 in binary with your hand.

41. Homework Subject Homework Date
Computing
Review 1. Binary Basics
and practice counting to 15 in binary with your hand.