Shiki: Any number times zero is zero.
Kyubey: I see. (relates this all to Homura)
Homura: You know we have good food up here, right?
The Crystal Caverns A bird's gotta sing.Jo: Hmmm.... Want to watch a movie?
Homura: Exactly.
Shiki: Imagine it if I had nothing. I could have five nothings, but in the end it would still be nothing.
The Crystal Caverns A bird's gotta sing.Shiki: So anything times zero is still zero. And it's impossible to divide by zero for that reason.
Homura: You poor soul.
The Crystal Caverns A bird's gotta sing.Jo: I guess.
Homura: You must be so lonely.
Shiki: Because you can only divide by something that has a clear other multiple. Because 0 x everything = 0 if you divide by zero you get everything.
The Crystal Caverns A bird's gotta sing.Jo: Just weird. Like the whole world was different.
Shiki: Even mathemeticians gave up trying to figure it out.
Homura: Maybe we could hang out?
The Crystal Caverns A bird's gotta sing.Shiki: That point was to show why the math doesn't work.
Homura: (sits down) What else do you wish to eat?
The Crystal Caverns A bird's gotta sing.

Kyubey: I wonder how that happened?
Shiki: You did well on everyone except the easy ones.
The Crystal Caverns A bird's gotta sing.