cero 0 zero

uno 1 one

dos 2 two

tres 3 three

cuatro 4 four

cinco 5 five

seis 6 six

siete 7 seven

ocho 8 eight

nueve 9 nine

diez 10 ten

once 11 eleven

doce 12 twelve

trece 13 thirteen

catorce 14 fourteen

quince 15 fifteen

dieciséis 16 sixteen

diecisiete 17 seventeen

dieciocho 18 eighteen

diecinueve 19 nineteen

veinte 20 twenty