220 = 200 can you prove it?

Can you prove that 220 is equal to 200. But it's simple in none English languages. If you say 220 digit by digit it will be "two two zero" . i don't know well it in English grammar. But i think that it's seen as 2 and double zero. Maybe it can be "two two zero" in English. i don't know well exactly.

Now how can you prove 1 +1 = 1 ?