Lesson 4 - Binary numbers

2. LEARNING OBJECTIVE
 Learn how to decode binary numbers.

3. LEARNING OUTCOMES
 I can decode decimal numbers to and from binary…
 I can use an ASCII table to decipher an encoded
message written in binary…
 I can use a binary calculator to decode binary
numbers…

4. HOW DO COMPUTERS TALK?
Is this right?
Hello Bill
how ya
doin?
Not bad Steve
but my hard
drive’s
playing up a
bit.
 I can decode decimal numbers to and from binary…
 I can use an ASCII table to decipher an encoded
message written in binary…
 I can use a binary calculator to decode binary
numbers…

5. HOW DO COMPUTERS TALK?
NO!!! This is more like it:
10110011
01011010
10000101
10010100
10010100
11010111 10110101
 I can decode decimal numbers to and from binary…
 I can use an ASCII table to decipher an encoded
message written in binary…
 I can use a binary calculator to decode binary
numbers…

6. COMPUTER TALK
Computers communicate and share data using
1’s and 0’s.
This is called:
Binary
 I can decode decimal numbers to and from binary…
 I can use an ASCII table to decipher an encoded
message written in binary…
 I can use a binary calculator to decode binary
numbers…

7. BINARY
Usually written as 8 bits:
The people holding signs would be 1’s and those
without would be 0’s.
128
+ +
= 11
 I can decode decimal numbers to and from binary…
 I can use an ASCII table to decipher an encoded
message written in binary…
 I can use a binary calculator to decode binary
numbers…

8. DECODING BINARY
The 8 bits represent:
128, 64, 32, 16, 8, 4, 2, 1
So to convert 0 0 0 1 0 1 0 1 we can use
the table below:
128 64 32 16 8 4 2 1
0 0 0 1 0 1 0 1
Adding these together gives 21
 I can decode decimal numbers to and from binary…
 I can use an ASCII table to decipher an encoded
message written in binary…
 I can use a binary calculator to decode binary
numbers…

9. MAIN TASK 1
Use the help sheet called “Decoding Binary
Numbers” to decode your secret message.
 I can decode decimal numbers to and from binary…
 I can use an ASCII table to decipher an encoded
message written in binary…
 I can use a binary calculator to decode binary
numbers…

10. MINI PLENARY
What is the secret message?
Share it with the rest of the group
 I can decode decimal numbers to and from binary…
 I can use an ASCII table to decipher an encoded
message written in binary…
 I can use a binary calculator to decode binary
numbers…

11. MAIN TASK 2
In pairs (or individually) play the Binary
Game and see what score you get:
1. Go to Moodle
2. Year 7
3. PC Basics
4. Binary Lesson
5. Binary Game
 I can decode decimal numbers to and from binary…
 I can use an ASCII table to decipher an encoded
message written in binary…
 I can use a binary calculator to decode binary
numbers…

12. PLENARY
Complete the following questions to test your knowledge and
understanding of binary …
1. The 8 bits represent the following numbers
128, 64,…., 16, 8, …., 2, ….
2. I can decipher the follow code using the ACSII table:
72 +69 + 69 + 79
3. I can calculate the following binary code:
0, 0, 0, 1, 0, 1, 0, 1 =
 I can decode decimal numbers to and from binary…
 I can use an ASCII table to decipher an encoded
message written in binary…
 I can use a binary calculator to decode binary
numbers…