Binary Lesson 4 bitmap images

In this lesson you will learn how colours are represented on a computer screen or tv.

Objectives and Outcomes

• be able to explain how binary is used to create images (band 4).
• be able to apply your understanding to create an image using binary (band 5).
• be able to link the theory of binary images to file sizes and how this can affect upload and download times of different images to and from the internet (band 6).

Your tasks

1.  Open a new blog post and title it the same as this one.

2.  Explain how binary is used to create images.  

This slideshow may help remind you...

Binary bitmap images

3.  Make a copy of the bitmap work sheet below and design a bitmap image by inputting the binary code for the colours you want in the relevant cell.

Bitmap image worksheet

4.  When you have finished it, share it to anyone with the link and copy/paste the link to your blog post under your written work for task 2.

5.  Try to work out the file size (in bytes) of your bitmap image (remember each pixel has 4 bits so add them up for total and then divide by 8 for the number of bytes).

6.  Explain how this work links to download and upload times of images to and from the internet.

Publish!

Binary lesson 3 - letters

In this lesson you will discover how binary is used to represent all the letters and symbols on the keyboard, as well as numbers.

Objectives and Outcomes

• Be able to describe how computers only understand binary.
• Be able to explain how binary is used to represent letters as well as numbers.
• Be able to apply this understanding to decode and code messages from binary and into binary.
• Link ideas of binary code to any other codes you know that only have 2 symbols.

Your tasks

1.  On a new post titled the same as this, describe how computers only understand binary.

2.  Explain how binary is used to represent letters as well as numbers and give 3 examples.

Use this slideshow if you need reminding for this task....

Binary representing letters

3.  Go to the 'Binary messages to decode' Google doc below and, using the ASCII codes link below, work out what the messages say.

Binary messages to decode

ASCII codes for alphabet

4.  Write the number of each message and what it says on your post.

5.  Now write 3 messages in binary for another person to decode (not rude!).

6.  Write both the message in binary and the message in letters on your post.

7.  Describe on your post any examples of other messaging codes that are binary, ie only use 2 symbols.

8.  Are there other codes that computers use?  Try to find out info on hexadecimal code, what it is and how computers use it.

Binary Lesson 2 - numbers

Last lesson you learned about binary code and how to change between denary (decimal) numbers and binary numbers.

This lesson you are going to learn how to add up binary numbers.

Objectives and Outcomes

• Be able to explain how binary is used to represent denary (decimal) numbers. (band 4)
• Be able to apply your understanding to adding binary numbers together and converting them to denary. (band 5)
• Be able to link the ideas of binary code and your knowledge of electricity to show why computers can only use binary code to represent data (information). (band 6)

Your Tasks

1.  Open a new blog post and title it the same as this one.

2.  Copy/paste the Objectives and Outcomes on your post.

3.  Underneath them write, in your own words, how binary is used to represent denary or decimal numbers.

4.  Try and show your knowledge and understanding of Band 6 statement in Objectives and Outcomes by answering it under Task 3 writing.

5.  Open this link.....Adding binary numbers work sheet

Make a copy of the worksheet (File - Make a copy) before you try and work on it.

6.  Work through adding 3 and 4 bit numbers.

7.  Work through adding 3, 4 and 6 bit numbers.

8.  Work through adding 3, 4, 6 and 8 bit numbers.

You can use this slideshow if it helps you to remember how to add binary numbers...

Adding binary numbers slideshow

9.  When you are finished, share your worksheet (click Share - Advanced - change it from Private to Anyone with the link) and copy/paste the link to your blog post.

Extension!!!
https://docs.google.com/a/cooper.oxon.sch.uk/spreadsheets/d/1o8jjyMlHxTHbXeP2aCUGnY5UJK3H4GkTocmeD32yIoo/edit?usp=sharing

Publish!