This Application Problem is a part of the Lesson 8, Unit 2, Grade 1. A tree lost 8 leaves one day and 4 leaves the next. How many leaves did the tree lose at the end of the two days? Use a number bond, a number sentence, and a statement to match the story. Extension: On the third day, the tree lost 6 leaves. How many leaves did it lose by the end of the third day?