This Application Problem is a part of the Lesson 29, Unit 2, Grade 1. Hae Jung had 13 markers, and she gave some to Lily. If Hae Jung then had 5 markers, how many markers did she give to Lily? Students continue to consider take apart with addend unknown problem types in this problem. During the Debrief, students have the opportunity to apply today's objective to the problem, writing number sentences to show the two steps in the Level 3 strategy of taking from ten.