This Instructional Activity is a part of the Lesson 11, Unit 1, Grade 7. This is students' first experience evaluating complex fractions. Be sure to relate the process of evaluating complex fractions to division of fractions. Please note that the solutions shown are not the only ways to solve these problems. Accept all valid solutions. The next example asks Meredith to determine the unit rate, expressed in miles per hour, when a turtle walks 7/8 of a mile in 50 minutes.