This Problem Set is a part of the Lesson 25, Unit 5, Grade 3. In this lesson, students continue showing the equivalence of fractions and whole numbers using number lines. First, they show that 3/3 = 2/2 = 1/1 = 1, and notice that for fractions equivalent to 1 whole, the number of parts being counted and the total number of parts are the same. Then they show that 6/3 = 4/2 = 2/1 = 2, and discuss the difference between 2/1 and 2/2.