Anonymous A. answered 10/12/22
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Hi, Jakobey B.
In a sense, you are correct when you say that the numbers 16 - 19 in Spanish are addition as in 10 + 6 = 16 and so on.
There are really (2) ways to write the numbers 16 - 19 in Spanish.
(a). one way is to say "ten and six" , "ten & seven"..... diez y seis , diez y siete
(b).another way is to combine the number words into one word.
so then the "z" in diez becomes a "c" and the "y" becomes an "i".
Both ways are still pronounced the same way.
dieciseis, diez y seis, sixteen - 16
diecisiete, diez y siete, seventeen - 17
dieciocho, diez y ocho, eighteen - 18
diecinueve, diez y nueve, nineteen - 19
You made a very "keen" observation. Good job!