11	once		25	veinticinco
	12	doce		26	veintiséis
	13	trece		27	veintisiete
	14	catorze		28	veintiocho
	15	quince		29	veintinueve
	16	dieciséis		30	treinta
	17	diecisiete		40	cuarenta
	18	dieciocho		50	cincuenta
	19	diecinueve		60	sesenta
	20	veinte		70	setenta
	21	veintiuno		80	ochenta
	22	veintidós		90	noventa
	23	veintitres		100	cien
	24	veinticuatro

Notice that from 16 to 19, each number is a compound. In other words, to say 16, you say ten and six. In Spanish, diez means ten, and seis means six. The number 16, then, is composed of these two numbers, dieciséis. This same pattern is followed for the 20's. 20 is veinte; to say 21 you combine veinte and uno to make veintiuno.

Beginning with 31 this pattern changes; numbers are written as three separate words. For example, treinta y uno, cuarenta y dos, cincuenta y tres etc.