Changing Places Center

In the game Changing Places, students are to pick a 3-digit number. They then draw five cards. The cards all have an operation and number on them. For example, they may say +300, -40, +200, etc.  From their five cards, they choose three to use in an equation. They begin with their starting number, then carry out the operations in their equation. The new total is their next beginning number. They repeat the process.