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First, you have to teach long division and long multiplication to your 7B people. Like the concept and idea and truly hope for adoption.

Is it possible to reduce to addition and subtraction? I feel that multiplication and division is a high barrier for most.

Thanks cgsmith, a pocket calculator will be great when decoding/encoding by hand. Im guessing that low tech phones (even old nokias) can do the trick by using it as calculator, but then that may not be as low tech as needed.

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