Numerale English

[Liverpool]

how can say? 34,34 or 34,234 Thanks

[Квас]

If your comma means decimal point, I think in Latin it would be

34.34 trīgintā quattuor et trīgintā quattuor centēsimī centēsimae   
34.234 trīgintā quattuor et ducentī  trīgintā quattuor mīllēsimī mīllēsimae

Correction:

I have received a hint that the denominators must be feminine, because the word partēs parts is implied (it's feminine).