数 (shǔ): to count

Mom asked Xiaoming to count how many eggs were left in the fridge; he counted twice and confirmed there were still six.

The teacher walked into the classroom, counted the students in their seats, noticed one was missing, and asked the class monitor who hadn't come.

Grandma counts the pills in her medicine box every evening to make sure she won't forget to take them the next day.

Before the match, the referee counted the players on the court, confirmed each team had five, and then blew the whistle.