We just learned how to count to 15 in Spanish, let's keep going!
16 dieciséis - sounds like dee-ay-ss-ee-say-ss/?/
17 diecisiete - sounds like dee-ay-ss-ee-see-eht-ay /?/
18 dieciocho - sounds like dee-ay-ss-ee-oh-choh /?/
19 diecinueve - sounds like dee-ay-ss-ee-noo-ay-vay /?/
20 veinte - sounds like bay-een-tay /?/
(from: wikipedia - Association of Spanish Language Academies)
Do you remember how to say it in French?
French - seize, dix-sept, dix-huit, dix-neuf, vingt