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Indeed — you can't even represent 0.1 in IEEE floating point, so who in their right mind would try to build a measuring system on tenths?

> "you can't even represent 0.1 in IEEE floating point"

Not true, the IEEE 754-2008 standard provides a Decimal Floating Point specification in binary.

Ah, well, you're the best kind of correct. IBM even have instructions for it.

I'll counter with the Ferranti Orion (1959) which had mixed-base operations (primarily for £sd accounting).