Common Three Game
What You Will Need: Nothing!
Set-Up: Divide the teens into three teams.
How to Play: Each team has 5 minutes to discuss their interests and find three things they have in common, such as:
A shared favorite holiday
Their favorite subject in school
Growing up in the same area
The same favorite color
Then, one player from each team will announce their commonalities to the larger group so everyone can get to know each other. Feel free to shuffle up the teams and repeat multiple rounds.
Taken from: https://www.scienceofpeople.com/icebreakers-for-teens/