Are you looking for a fun way to help students learn to trade coins? Granny's money is an engaging math center to help students understand the real world reason people want to trade coins. No one wants to pack around a fifty pound purse! I've included a short, easily readable story for kids to understand the problem and a communication page to help students share their solutions. You can use it as a differentiated center for students working at various levels since there are mixed pennies, nickels, and dime sheets OR you can change out the activities as your students' skills increase.