Learn how to use money by playing a shopping game Cute aliens will help children learn how to calculate change by shopping and exchanging money. This app is developed for children to master the ways of using money with a simple and fun game. Can't Calculate? No problem! Many tools for learning about money require you to be able to calculate. However this game, will help you learn how to exchange money by simply choosing the right amount of change, so you can experience the rules of money eve