Numbers 16–20

Here is great news: numbers 16–19 follow a pattern! They all start with dieci- (which comes from diez, meaning ten) and then add the ones digit. Sixteen is dieciséis (diez + seis). Seventeen is diecisiete (diez + siete). Eighteen is dieciocho (diez + ocho). Nineteen is diecinueve (diez + nueve). See the pattern? Dieci + the number!