2412. #quīnctus#, the older form of #quīntus# (170, 4) is sometimes
found in old and even in classical writers. Instead of #septimus# and
#decimus#, the older #septumus# and #decumus# are not uncommon (28).
2413. In the ordinals from _twentieth_ upwards, the older forms
#vīcēnsumus# or #vīcēnsimus#, #trīcēnsumus# or #trīcēnsimus#, &c., &c.,
are not infrequently found instead of #vīcēsimus#, #trīcēsimus#, &c.,
&c. (63; 28).
2414. In the numeral adverbs from #quīnquiēns# upwards, later forms in
#-īēs# (63) are often found: as, #quīnquiēs#, #deciēs#, &c., &c.
2415. In cardinals and ordinals from _thirteen_ to _seventeen_
inclusive, the larger number sometimes comes first, and in cardinals
#et# is sometimes used, though rarely in Cicero.
#decem trēs#, L. 37, 30, 7, _thirteen_. #fundōs decem et trēs relīquit#,
_RA_. 20, _he left thirteen farms_. Rarely the smaller number comes
first with #et#: as, #dē tribus et decem fundīs#, _RA_. 99, _of the
thirteen farms_.
2416. Numbers from 18 to 99 inclusive which end in 8 or 9 are usually
expressed by subtraction, as in the list (2405); less frequently (not in
Cicero, rarely in classical writers) by addition: as, #decem et octō#,
4, 19, 4; #decem novem#, Ta. _H._ 2, 58.
2417. In compound numbers from _twenty-one_ to _ninety-seven_ inclusive,
except those which end in _eight_ or _nine_ (2416), the smaller number
with et usually comes first or the larger number without #et#, as in the
list. But rarely the larger number comes first with #et#: as, #vīgintī
et septem#, _V._ 4, 123, _twenty and seven_.
2418. In numbers from a _hundred and one_ upwards, the larger number
comes first, either with or without #et#; but with distributives #et# is
not used. With cardinals and ordinals the smaller number sometimes comes
first with #et#; as, #iīs rēgiīs quadrāgintā annīs et ducentīs
praeteritīs#, _RP_. 2, 52, _after these two hundred and forty years of
monarchy were ended_.