This Application Problem is a part of the Lesson 18, Unit 6, Grade 1. A farmer counted 12 bunnies in their cages in the morning. In the afternoon, he only counted 4 bunnies in their cages. How many bunnies disappeared from their cages? Today's problem is a take away with change unknown problem type. As Topic F, which focuses on varied problem types, approaches, begin to take note of students' strengths and weaknesses for specific problem types.