Pi Day Riddles! (7 Pi Each)!

I solved it by pattern recognition without understanding the math behind it, so thank you for the explanation.

For number one, there is a method. It is just like the locker riddle exept narrowed down to five hundred instead of 1000

I already explained the quick solve

Can you explain your answers? When you post an answer, you should be able to answer how you got it. 

BTW Nice Job!

I will post the updated pi later.

Do I get pi b/c I was the first to explain my answers

Since @Chessisfunforme didn't explain, he/she doesn't get any pi. @createsure got the last four problems, but for helping to explain #1 and some others, @KakashiHatake2 gets 7 pi.

Hopefully, this is fair. 

@createsure 28 pi

@KatashiHatake2 7 pi

thanks!

Nice

Fair enough