*I am a private tutor. To make math more fun for my students, I often play a modified version of a Pompeii-themed boardgame with them during our lessons. For every question they answer correctly, they get a certain number of moves — depending on the question’s difficulty — to help their pawns escape the city, which gets increasingly consumed by lava as the rounds continue. For every wrong answer, they forfeit their turn and I get to move my pawns instead. The person with the most escaped pawns by the end of the game is the “winner”.*

*To try to instill a habit of always checking their work, I’ve also created a rule that if they don’t read over their steps or at least double-check the question again when they get to their answer, I get to just take one of their pawns and pop it straight into the volcano in the corner of the board. I am brutal with this and it has worked tremendously well; I don’t usually have to punt a pawn into a volcano more than once or twice before double-checking their work becomes an automatic process. *

*I am playing this game with one of my fourth-graders — age nine. After giving him a two-digit multiplication question, I look over and check his answer once he’s finished — and double-checked!*

**Me:** “You missed something in your addition there. Check that last column again.”

**Student:** “What do you mean?”

**Me:** “That shouldn’t be a zero. Check it again.”

**Student:** “No, that’s a nine!”

*I take the whiteboard back from him, at which point I can see that he indeed wrote a nine, not a zero; I missed the “tail” of the nine from the angle I was viewing it from and the fact that he’d written the answer right on the edge of the board. But he got the right answer, fair and square.*

**Me:** “Whoops, you’re right. It *is* a nine. Sorry, I thought that was a zero. My bad.”

*Without skipping a beat, the student wordlessly takes one of my pawns off the board, and, without breaking eye contact, puts it straight into the volcano.*

**Me:** “…”

**Student:** **Deadpan** “You didn’t double-check.”

*Okay, kiddo. You win this round!*