Unit 1
Area and Surface Area
Unit Narrative
In this unit, students reason about areas of polygons and surface areas of polyhedra, building on geometric understandings developed in earlier grades.
In grade 3, students found the area of rectangles with whole-number side lengths. They also found the area of rectilinear figures by decomposing them into non-overlapping rectangles and adding those areas. Students used a formula for the area of rectangles in grade 4 and found the area of rectangles with fractional side lengths in grade 5.
In this unit, students extend their reasoning about area to include shapes...