Tvo-Pravic, like most Terran languages, counts in base 10. This is probably because, as on Earth, fingers are a salient feature of counting. This idea is somewhat supported by the change of initial consonant after five.
The numbers and number system are:
ra- (repeat, or again) is also treated as a number prefix. So twice more is rane-.
Other numerical prefixes include: sha- (many); la- (most); tha- (every or all); and pa- (a few).