This Application Problem is a part of the Lesson 6, Unit 1, Grade 2. This Application Problem follows the Concept Development to allow students to apply their understanding to a take from result unknown problem. The allotted 15 minutes includes 5 minutes to solve the Application Problem and 10 minutes to complete the Problem Set. Mary buys 30 stickers. She puts 7 in her friend's backpack. How many stickers does Mary have left?