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For numbers above 15, it's all adding, just with a few minor changes. Take the word dieciseis, for example, from the picture. The word from "Diez (10) y (and) seis (6)" to mean "16". However, you have to change the 'z' in 'diez' to a 'c', and the 'y' to an 'i' and squish it all together to make one word.
Fill these out. The first one is done for you.
16 = diez y seis = dieciseis
17 = y =
18 = y =
19 = y =