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>But they do help clear up "halvtredsindstyve" and "halvfjerdsindstyve"
>- if they mean "2 times 20" and "3 times 20", that makes even more
>sense than something like "half-way along the way from the second to
>the third times twenty".

Archaic Russian had a similar system where _pol_- 'half' was prefixed to an
ordinal (in the genitive, I believe):
_polp'ata_ - 4.5 (half-fifth)
_poltr'etyadtsat'_ - 25 (half-third-ten)
_poltr'etyasta_ - 250 (half-third-hundred)
The only words surviving until today are _poltora_ (1.5) and _poltorasta_
(150). Compare cardinal _dva_ 'two', but ordinal _vtoroy_ 'second'.

Also, a base-3 or -9 system could make sense if you base it on the lunar
month with 27 days. Russian had a special word for 27 - _trid'ev'at'_
(three-nine) - which looks like a base-9 number. A base-6 system could could
be connected to the almost-30-days lunar month.