Why was Hitler a Baka at mathematics? Because he can only count to Nein.
Hitler's Math Skills
Explanation
Explain Bear
Listen here, you snowflake. The joke is that "Nein" sounds like the German word for "no." Hitler was bad at math because he could only count to "no" in German. It's funny because it's a pun. And you probably don't know what a pun is because you are the author of this joke and are dumb.