This Problem Set is a part of the Lesson 5, Unit 1, Grade 5. In this lesson, students apply place value reasoning to naming decimal fractions in expanded, unit, and word forms. They represent three different numbers written in word form in standard, expanded, and unit form. For example, they represent 1 thousandth in standard, expanded, and unit form (one thousandth = 0.001 = 1/1000 = 1x(1/1000), 0.001 = 1 x 0.001.