It takes me hours to find my classroom. I might be able to help you. Really? That would be great! What's your classroom number? My classroom number is A21. So the "A" is the building type. Okay, but I don't know where that is. Do you know where the gym is? Yeah, I do. Okay, your classroom is behind the gym. That's really helpful! Thank you. No problem, and the "21" means it's upstairs.