Word Problem

Mrs. Thompson's grade two class is studying geese.  The geese have started to leave on their winter migration.  During a class field trip the class saw two flocks of geese flying by.  The first flock had 97 geese in it.  The second flock had 90 geese in it. 

Write the math equation: __________________________

How many geese did Mrs. Thompson's class see? _______

Show your work!