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Inspired by a talk at JSConf AU I decided to write my own number system in C#. Have you ever written your own number system in a programming language? Turns out that there's a bunch of interesting things you need to do, like work out how you determine if one number is different to another. Or how about elementary arithmetic, you need to also implement that yourself. This talk is a bit of a journey about what happens when you have to implement math from the ground up. A recording of the talk I gave at Sydney ALT.Net on the 29th July 2014.