On the first day of school, Mrs. McGillicuddy had 25 students registered for the morning session of kindergarten, but 3 students were absent; and she had 24 students registered for the afternoon session, but 4 students were absent. How many students did Mrs. McGillicuddy have over the two kindergarten sessions?
25-3=<T>subtract(25, 3)=22 students
24-4=<T>subtract(24, 4)=20 students
She had 22+20=<T>add(22, 20)=42 students
