Library of Virtual Manipulatives

Coin Problem: This manipulative consisted of finding the counterfeit coin. You are provided with 8 coins and must determine which coin is the counterfeit. In the first two challenges when you are provided with 8 and 9 coins it informs you if the counterfeit coin is lighter or heavier than the others. When you move on to the 12 coin challenge you must find out if the counterfeit coin is lighter or heavier and then identify the counterfeit coin. The 12 coin challenge requires more strategy in order to solve the puzzle. This was a great manipulative.