In this week’s lesson, I continued the theme of how data is stored in computers, this week focusing on binary addition. Learning Objectives:
Lesson 1: Theory (Binary Addition) Suggested time: 50 mins Starter: I started with a fun starter activity courtesy of Mark Ward via CAS called Binary Bingo. To download the activity, click here. Each student was given a bingo card and numbers were picked at random using a free random name selector (see Classroom Management Tools). The first student to get a full house was the winner. Main: I began by writing a simple sum (adding to denary numbers together) on the board: I then asked for a volunteer to solve it (showing all working out). Next, I introduced a simple binary sum: I explained that adding binary numbers is exactly the same as adding denary numbers however, instead of carrying groups of ten, you carry groups of 2. I followed this by writing a couple more simple binary sums on the board and asked for volunteers to attempt to solve these. Next I explained that when we add two 1s we need to carry over to the next column. I demonstrated this using the following sum: I followed this by asking students to work out the following (explaining their working out): Finally, I wrote the following binary sum on the board and asked the students to solve it. I then asked the students if they spotted the problem. I explained that, if we only have 4 bits to store the result, there would be no room for the final carry – resulting in the wrong answer. I explained that when there isn’t room to store the resulting calculation, we get an error which we call overflow. Finally, I gave students a series of binary addition challenges courtesy of Chris Barnard via CAS. You can download the worksheet and answer sheet here: Binary Addition Exercise Extension: Students were directed to the following YouTube video explaining binary subtraction: Plenary: Students played the CISCO Binary Game: http://forums.cisco.com/CertCom/game/binary_game_page.htm Resources: Useful resources: Binary Calculator – http://gwydir.demon.co.uk/jo/numbers/binary/add.htm Binary Arithmetic Task  http://www.allaboutcircuits.com/worksheets/bin_math.html Lesson 2: Raspberry Pi  Python Challenge
Suggested time: 50 mins Main: Students were instructed to setup their Raspberry Pis and to launch IDLE 3. Students were then asked to attempt a series of introductory Python challenges courtesy of Tom Gilmour via CAS: http://community.computingatschool.org.uk/resources/332 Alternative: Alternatively, if you do not have access to a set of Raspberry Pis, students can still complete the Python challenges: To install Python for FREE, go to the python.org website and download a standard installation of the latest version of Python. This will provide you with everything you need. Comments are closed.

AuthorSimon Johnson Microsoft Innovative Educator Expert / MIE Trainer
Minecraft Cert. Educator / Global Mentor
CAS Master Teacher
Raspberry Pi Cert. Educator
Tickle Ambassador
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June 2017
CategoriesAll Algorithms Cpu Fundamentals Hardware Input & Output Memory OCR A451 Software Storage 