In my Year 7 Digital Technologies class we have took a look at binary. The students had to decode my instructions on the board (they had 5 flip cards to help 1,2,4,8,16 and we used a=1, b=2, c=3, z=26).
My instructions asked the students to write a secret message to their "buddy".
About 15 minutes of explicit teaching of how to use the binary system and our flip cards occurred prior to the task. This proved a big success and we then continues on and discussed Binary further (a=97 etc.etc.)
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