Actual Latin speakers — or more truthfully writers — used Roman numerals instead of the Arabic system English speakers use today. But Roman numerals are still in use, probably most notably in counting Super Bowls and in copyright dates. The following table shows you the basic numbers, the Latin, and the pronunciation:

Roman Numeral Latin English
I unus (oo-nus) one
II duo (du-oh) two
III tres (trays) three
IV quattuor (kwuht-tu-ohr) four
V quinque (kween-kweh) five
VI sex (sehks) six
VII septem (sehp-tehm) seven
VIII octo (ohk-to) eight
IX novem (noh-wehm) nine
X decem (deh-kehm) ten
L quinquaginta (kween-kwah-gihn-tah) fifty
C centum (kehn-tum) one hundred
D quingenti (kween-gehn-tee) five hundred
M mille (mihl-leh) thousand