101

 Take a look at this code and tell me what generation of programming language is used here. It is important that you can EXPLAIN how you came up With your answer.

 Please get out one piece of paper and something to write with.  Once you have done that push your chair in and walk quickly and quietly to the back of the room.  Wait there for further instructions.

 From our previous lessons it’s clear that computers speak a very unique language.  In order for you to have a better appreciation for just what a computer does we are going to learn to speak their language.  Their language is called binary.

 This activity will help you understand how a computer can use 1’s and 0’s to accomplish so many things.  I am going to hand out a set of cards to you and I would like you to use these cards to accomplish one simple task.  Find a way that you can use these cards to count from 1 through 31.  Please DO NOT share answers outside of your groups.

 Each card has one of two values.  If it is face up it is a 1 which means it is ‘on’  If it is face down it is a 0 which means it is ‘off’  Let’s take a look at how that works…

 What does represent in binary  If you said 1 you are correct but do you understand why?  Take a look at the following graphic.  Earlier we said that a 0 was ‘off’ that means you simply ignore them.  A 1 is ‘on’ which means any card that has a 1 needs to be added to all of the other cards that have a

 Lets try that one more time

 Notice the pattern moving from right to left.  The first card has a value of 1.  The second card has a value of 2 which is twice as large as the previous.  The third card has a value of 4 which is twice as large as the previous.  See the pattern?

 Please place the names of every member of your group in the upper right hand corner on one page.  Give a title to this page and make it ‘Binary Quiz’  The rules are as follows:  You cannot communicate with other groups  EVERY MEMBER of your group needs to understand HOW you came up with your answers  EVERY MEMBER of your group needs to be able DEMONSTRATE that they can come up with answers on their own

 Please answer the following questions on your sheet.  Represent the following numbers in binary. 22  10  21  27  31  How many numbers can be represented using the five cards you have. Warning – This is sort of a trick question. Think about it before you write your answer.  In our example we had only 5 cards. What would be the largest number you could represent if I gave you 8 cards?

 Use what you know to decode the message on the ‘Sending Secret Messages’ worksheet.  This homework is due TOMORROW.