The NCTM Illuminations site offers Coin Box, an application that allows students to count money, using coins and/or coins on the hundred board. The app allows students to move the coins as they count. Students may opt to place similar coins in a row for easier counting, etc. The game also prompts students that their answer is too little or too much, allowing them to try again.
Students may use this application in school or at home to practice counting money, making change, and exchanging coins. Be sure to include this free site in resources for parents.