20:I[96787,["2545","static/chunks/c16f53c3-e5949be40144c808.js","3063","static/chunks/3063-c8c332be37dc3174.js","9469","static/chunks/9469-27aa00ec6c226940.js","538","static/chunks/538-46f18107b2a6b5af.js","8161","static/chunks/8161-67a15664d344c8d8.js","6786","static/chunks/6786-3c6282ec18dbd4c9.js","3099","static/chunks/3099-cf023cdf5fd20f88.js","5171","static/chunks/5171-580e0aadd1a8fcb4.js","6403","static/chunks/6403-015b9283403796d1.js","8335","static/chunks/app/(dynamic)/%5BcourseSlug%5D/lexicon/%5BitemId%5D/%5BitemSlug%5D/page-e6390c6b6490b0b5.js"],"default"] 21:T6a4,

In this lesson you learn to count from 16 to 29 in Spanish. You'll see that from 16 onward there is a regularity in counting. From 30 onward, slightly different rules apply, which luckily also follow a regular pattern.

0 - cero	10 - diez	20 - veinte
1 - uno	11 - once	21 - veintiuno
2 - dos	12 - doce	22 - veintidós
3 - tres	13 - trece	23 - veintitrés
4 - cuatro	14 - catorce	24 - veinticuatro
5 - cinco	15 - quince	25 - veinticinco
6 - seis	16 - dieciséis	26 - veintiséis
7 - siete	17 - diecisiete	27 - veintisiete
8 - ocho	18 - dieciocho	28 - veintiocho
9 - nueve	19 - diecinueve	29 - veintinueve

You have already learned that one before a masculine noun becomes un and before a feminine noun becomese una. The same principle applies to numbers that end in uno.