This Problem Set is a part of the Lesson 3, Unit 6, Grade 4. In this lesson, students work with place value disks and the number line to represent and identify decimal numbers with tenths as a unit. They use place value disks to rename groups of 10 tenths as ones. Then they record the value of each digit of a mixed number in fraction expanded form, followed by decimal expanded form - for example, 2 ones 4 tenths = 2 4/10 = (2 x 1) + (4 x 1/10) and 2.4 = (2 x 1) + (4 x 0.1).