Download - Lesson 4 binary numbers

BINARY

NUMBER

S

L ES

SO

N 4

LEARNING OBJECTIVE

Learn how to decode binary numbers.

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…

HOW DO COMPUTERS TALK?Is this right?

Hello Bill how ya doin?

Not bad Steve but my hard drive’s

playing up a bit.




HOW DO COMPUTERS TALK?NO!!! This is more like it:

10110011 01011010 10000101

10010100 10010100 11010111 10110101




COMPUTER TALKComputers communicate and share data using 1’s and 0’s.

This is called:

Binary




BINARYUsually written as 8 bits:

The people holding signs would be 1’s and those without would be 0’s.

128

+ += 11




DECODING BINARYThe 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…

MAIN TASK 1

Use the help sheet called “Decoding Binary Numbers” to decode your secret message.




MINI PLENARY

What is the secret message?

Share it with the rest of the group




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




http://forums.cisco.com/CertCom/game/binary_game.swf

PLENARYComplete the following questions to test your knowledge and understanding of binary …

1. The 8 bits represent the following numbers128, 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 =




Download - Lesson 4 binary numbers

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