Many students will enjoy this game that's a little bit Battleship, a little bit Telephone, and a little bit Monopoly. My students in particular love tallying up their scores and getting "paid" at the end!
In this game, students use and improve place value knowledge by practicing recognizing, pronouncing, and listening to multi-digit numbers. They also work on multiplying by 10, 20, and 50. Note that this game is highly flexible, and can be adapted to work with very large or smaller place values, and also with multiplying by whatever numbers your class is currently learning to use or needs practice with.
In this game, students will pretend to be a bank teller and bank manager in separate bank branches. The teller must tell the manager some important numbers over the phone, because the internet is down. They will get "paid" according to how well they communicate.
After students spend time communicating large numbers, they fill out a "paycheck," scoring themselves and paying themselves according to how much they got right! Each right answer is worth $10, $20, or $50, so students practice multiplying and adding to find their final pay. I have found that students are so excited to get "paid" that they want to keep their game sheets and play at recess!