【How-to】How do you count to 10 in spanish

There’s no real pattern, you just have to learn them: uno, dos, tres, cuatro, cinco, seis, siete, ocho, nueve, diez, once, doce, trece, catorce, quince. Other than veinte (again), they all have a clear relationship with the related smaller number: cuatro <-> cuarenta, ocho <-> ochenta, etc.