When you think of name tags like this, you probably think of speed dating or awkward high school reunions. Of course, you're not going to make your kids do anything like that - but you can head to the dollar store and buy these tags to make math more fun for them. Instead of getting them to write their names, you could get them to write a mathematical equation on there.
Then, get the class to wander around the room, solving each other's problems! This will take the pressure out of math, and make the whole thing more engaging for everyone in the class.