Kelly Mrozik wears a cloth face mask as she asks her room of energetic first graders a question: What sign do you use when you want to add two numbers together?
Wayne, a student who sat on the carpet in front of her, points to a plus sign on the board.
Mrozik cheers: "Very good. Elbows, Wayne!"
The two bumped elbows. That's the school-during-the-coronavirus version of a high five. There are other versions, too.
"Sometimes we even do like a shoe bump, or we do a toe tap, or a happy dance," Mrozik says.