What the site is
Each page answers one question about Italian numbers: the words to 10, to 20 and to 100, how bigger numbers are built, how they sound, and how they are used in dates, prices, phone numbers and ages. The printables page has a 1 to 100 chart and a worksheet generator whose answer keys come as separate files.
Where the rules come from
Spellings and rules come from Treccani (the Vocabolario and the Enciclopedia dell’Italiano) and the Accademia della Crusca, named on each page where they are used. Where usage varies, the page says which form is printed and why. Every number word is generated by one engine and checked against a second, separate derivation: 3,000,145 checks, described on how the words are checked.
Who publishes it
Numbers in Italian is published by Digital Signet, a UK company that runs reference sites and builds software. It is independent and not affiliated with Treccani, the Accademia della Crusca or any exam board. The same team publishes numbersinfrench.com and numbersinjapanese.com, which share the worksheet engine.
Using the material
The chart and the worksheets may be printed and photocopied for classroom use. The site carries no advertising; what it measures is set out on the privacy page.