To count; to enumerate things or people one by one or in sequence.
出席者の人数を数えてください。
Please count the number of attendees.
指で一つずつ数えると確実だ。
Counting one by one on your fingers is reliable.
彼は家族の年齢を数えるのが苦手だ。
He is bad at keeping track of his family's ages.
1から10まで数える練習をした。
We practiced counting from one to ten.