## Which Coin Is Counterfeit?

## Opening

# Which Coin Is Counterfeit?

Suppose you have 12 coins, and one of the coins is counterfeit. You know that the counterfeit coin weighs less than the other coins.

- Can you use a balance scale to find the counterfeit coin?
- Turn and talk to your partner about this question. Share an idea about how you might approach the problem, but do not try to find the solution yet.

## Hint:

*Counterfeit*means*fake*; a counterfeit coin looks like a real coin issued by the government but is actually an imitation.- A counterfeit coin is made from cheaper metals, so it weighs less than a real coin.