The parts
| Part | Words |
|---|---|
| Units and teens | uno, due, tre, quattro, cinque, sei, sette, otto, nove, dieci, undici, dodici, tredici, quattordici, quindici, sedici, diciassette, diciotto, diciannove |
| Tens | venti, trenta, quaranta, cinquanta, sessanta, settanta, ottanta, novanta |
| Hundreds | cento, with a unit in front from 200: duecento, trecento, novecento |
| Thousands | mille for 1,000; a number + mila above it: duemila, diecimila, trecentomila |
| Million | un milione, a separate noun |
The order: largest first, all in one word
Each number is read from the left, just as the figure is, and the parts are written together.
| Figure | Parts | Italian |
|---|---|---|
| 47 | quaranta + sette | quarantasette |
| 81 | ottant(a) + uno | ottantuno |
| 365 | tre + cento + sessanta + cinque | trecentosessantacinque |
| 708 | sette + cento + otto | settecentootto |
| 1,492 | mille + quattro + cento + novanta + due | millequattrocentonovantadue |
| 2,026 | due + mila + venti + sei | duemilaventisei |
| 53,283 | cinquanta + tre + mila + due + cent(o) + ottanta + tré | cinquantatremiladuecentottantatré |
The three adjustments at the joins
1. A ten loses its last vowel before uno or ottoventi + uno is ventuno, ottanta + otto is ottantotto. It happens inside bigger numbers too: trecentoventuno, quarantottomila.
2. cento loses its o before ottanta, but keeps it before uno and ottocentottanta and quattrocentottanta, but centouno and centootto. Treccani’s Enciclopedia dell’Italiano calls elision after cento uncommon before uno, otto and undici, so centotto exists but is the rarer form. mille does not elide: milleuno, milleottocento.
3. A final tre is written tréOnly at the very end of the word, where the stress falls: cinquantatré, duemilatré, but cinquantatremila, where the stress has moved on.
Counting aloud in class
Counting runs are the quickest check that a class has the joins: going from diciannove to venti to ventuno, or from novantanove to cento to centouno, is where the rules show. The worksheet generator’s Fill the gaps exercise builds runs of six with two missing, and every other run straddles one of those crossings. Above 1,000 the runs step in hundreds or thousands, so pupils practise duemila, duemilacento, duemiladuecento.