You know, when I'm not out there saving the world from odd, I make a pretty mean sauce myself.

- How many meatballs do you put in?

- The recipe calls for 26 but I make my meatballs in groups of 10, so I just round up to 30.

- Hey, uh, what's rounding?

(tray clanging) - You don't know?

- No.

- Rounding is when you change a number to make it end with zero to make it easier to use.

So, if I had 16 or 17 ravioli, I would say, "Hey, I have about 20 ravioli."

- Ah.

So if I have 11 or 12 mice in the kitchen, I just say, "Hey, I got 10 mice in the kitchen!"

- Exactly.

By the way, you should still get that checked out.

- Right.

- But how do you know to round up or down?

- I'll show you, but you need to make me 20 pounds of spaghetti.

Yup.

It's a lot.

- I call this "meatball mountain".

Now, Tony, does 13 round up to 20, or down to 10?

- Uh, I don't know!

- Well, 13, here... Down to 10.

- Very nice.

What about 16?

- 16 rounds up to 20.

(applauding) - Wait!

What about 15?

It's right in the middle.

- If it's right in the middle, I make sure nobody's looking... ...and I give it a little nudge so it rounds up to 20.

- Get it?

- Got it.

- Good.

Now I can eat it.

- You've given us such a great gift today.

We're going to teach you the secret family dance.

- (both): LUIGI!

MUSIC!

- Ha ha ha!

♫ Ho!

Ho!

Hey!

Hey!