BTN had an report a few years ago on computer code and there was a good activity along side it abut using your fingers to represent binary code. The hang loose symbol – thumb and pinky extended – represented the number 17. This could be a good activity to do with upper primary students after they had been introduced to binary code.

http://www.abc.net.au/btn/resources/teacher/episode/20130326-computercode.pdf
www.abc.net.au/btn/resources/teacher/episode/20130326-computercode.pdf abc.net.au

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