This Application Problem is a part of the Lesson 2, Unit 5, Grade 2. Max has 42 marbles in his marble bag after he added 20 marbles at noon. How many marbles did he have before noon? This problem gives students a chance to apply their new learning and to practice an add to with start unknown problem-as in Module 4. Many students will incorrectly say 62 marbles. Encourage them to represent the problem using a number bond if they are struggling.