Forty.
Quadraginta.
Quadraginta anni.
Quadraginta (et) septem.
quadraginta duo or in numerals XLII
Quadraginta (et) quinque.
Twenty-nine in Latin is viginti-novem.
The Latin word for "a hundred and forty" is, according to Google Translate, centum quadraginta.
quadragenarian:meaning: a person in his/her 40's
quadraginta - 40 quaerit - looks for quanti - how much? quid - what? quietus - queit quies - who? quo - where? quod - because quoque - also
annus means year decem means ten the plural of annus is anni so ten years is decem anni it would be different if you were saying "for ten years" or "within ten years" then it gets a bit more complicated, but basically the answer to the question is decem anni
Do you mean Roman language or Roman numerals? In language 449 is quadringenti-ae-a quadraginta novem. In numerals it is CCCCXLIX
1. unus 2. duo 3.tres 4.quatuor 5. quinque 6.sex 7.septern 8.octo 9.novern 10.decern 11.undecim 12.duodecim 13.tredecim 14.quattuordecim 15.quindecim 16.sedecim 17.septendecim 18.duodeviginti 19.undeviginti 20.viginti 21.viginti unus 30. triginta 40.quadraginta 50.quinquaginta 60.sexaginta 70.septuaginta 80.octoginta 90.nonaqinta 100.centum