In previous lessons, students identified, described, and built solid shapes. In this lesson, students describe and compare the attributes of solid shapes. When describing and comparing shapes, students are not required to know or use language such as “faces,” “edges,” or “vertices.” Students may use their own language to describe these attributes, such as “sides,” “points,” or “corners.” If it is unclear to which part of a shape a student is referring, consider asking them to point to it.

In grade 1, students distinguish between defining and nondefining attributes of shapes. How does the work of this lesson prepare students for the work of grade 1?