uno - one
dos - two
tres - three
cuatro - four
cinco - five
seis - six
siete - seven
ocho -eight
nueve - nine
diez - ten
once - eleven
doce - twelve
trece -thirteen
catorce - fourteen
quince - fifteen
dieciséis = sixteen
diecisiete = seventeen
dieciocho = eighteen
diecinueve = nineteen
veinte = twenty