This Problem Set is a part of the Lesson 12, Unit 5, Grade 4. In this lesson, students use a number line and 1/2 to reason about the size of another fraction and then plot points on a number line by thinking about fractions in relation to 0, 1/2, or 1. Finally, students use the benchmarks 0, 1/2, and 1 to compare two fractions without using a number line.