I numeri :

a) the irregular : like in french, the numbers from one to sixteen are irregular, those above ten are spelt backwards : the units first.
1 uno
2 due
3 tre
4 quattro
5 cinque
6 sei
7 sette
8 otto
9 nove
10 dieci
11 undici
12 dodici
13 tredici
14 quattordici
15 quindici
16 sedici

From there, the numbers are called in the "right order" : Hundreds then tens then units. The rule is simple : every ten has two forms, one for vowel started suffixes, one for consonant started suffixes. This is almost like the Latin numbers(1), except x8 and x9 aren not called 2 before (x+1)*10 and 1 before (x+1)*10 respectively. One can remark that French and Italian evolved the same way from Latin, throwing away many letters in the process. The long triginta became trenta/trente, the even longer quadraginta became quaranta/quarante.

17 diciasette
18 diciotto
19 dicianove

b)the tens
20 venti (vent- when preceding a vowel)
30 trenta (trent-)
40 quaranta (quarant-)
50 cinquanta (cinquant-)
60 sessanta (sessant-)
70 settanta (settant-)
80 ottanta (ottant-)
90 novanta (novant-)

49 will thus be : quarantanove, 78 settantotto

From 70, there is an important behavioral difference between French French and Italian : while the French count by twenties from 60 (76 becoming sixty-sixteen, 94 eighty-fourteen), there is no such thing in Italian, as this is a Gaul inheritance and Italics weren't Gauls. Another French artifact is 80, called quatre-vingt (four times twenty). The Swiss flavor of French in contrast is grammatically equivalent to Italian (70 : septante,80 : octante,90 : nonante).

c)the hundreds and beyond
100 cento
200 duecento
300 trecento
400 quattrocento...

1,000 mille
2,000 duemila
3,000 tremila...

1,000,000 un milione
2,000,000 due milioni
3,000,000 tre milioni

The Italians being Europeans, they dont refer to 1000 millions (10e9) as billions, but as milliards. un billione is instead a million millions (10e12) 1,000,000,000 un miliardo
2,000,000,000 due miliardi
3,000,000,000 tre miliardi...

So the following number will be called :

123,456,789,012. Centoventitre milliardi quattrocentocinquantasei millioni settecentottantanovemiladodici.
(1) With the Latin numbers being decimal, almost as decimal as the modern system, one can wonder why they invented such a crazy 'MDCLXI'-based system and didn't come up with the Arabian/Indian numbers earlier.

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