Two of Mrs. Garcia's seventh-grade classes are going on a field trip. They plan to take a bus, tour a factory, and have lunch. Mrs. Garcia and one of her students, Melissa, are trying to figure how much the trip will cost.
Mrs. Garcia's first class going on the trip has 15 How many people are going on the trip?
students.
Mrs. Garcia added students + adults: (29 + 6).
Mrs. Garcia's second class has 14 students.
Melissa added adults+ students: (6 + 29).
Counting Mrs. Garcia, the number of adult
chaperones will be 6.
They both determined that people are going.
Which property illustrates that they should have gotten
the same answer?