What’s the Edge Length?

Students represent and determine the volume of a figure composed of rectangular prisms in which unit cubes are not shown and some needed edge lengths are unknown. Note: The Show What You Know screens, PDF, and Answer Key PDF were updated on 1/12/2026.

By Amplify Classroom

Grades: 5th Grade

Subject: Math

Learning goals: Today’s Goals • Determine the volume of a figure composed of rectangular prisms when some edge lengths are unknown. • Write expressions or equations to represent the volume of a figure composed of rectangular prisms when some necessary edge lengths are unknown. Materials Classroom materials: colored pencils or highlighters (as needed)