This Instructional Activity is a part of the Lesson 13, Unit 8, Grade 8. The purpose of this activity is for students to think about cube roots in relation to the two whole number values they are closest to. Students can draw a number line if that helps them reason about the magnitude of the given cube roots, but this is not required. However students reason, they need to explain their thinking. Monitor students multiplying non-integers by hand to try and approximate.