# The Cube Challenge

## Curriculum Goal

#### Primary: Geometry and Spatial Sense

• Identify congruent lengths, angles, and faces of three-dimensional objects by mentally and physically matching them and determining if the objects are congruent.

## Context

• Students begin by working in pairs and then in groups of four.

## Lesson

• Have pairs of students make 3D structures composed of 3, 4, and 5 multilink cubes.
• Ensure both students within a pair works with the same colour of cubes.
• Invite students to create as many unique structures as they can.
• Have each pair of students compare their structures with another pair of students.
• Ask the group of four to put each unique structure on a designated area (e.g., a mat).
• As an entire class, have students make sure they have created each shape.
• Ask students from each group to describe one of their shapes while the other groups check to make sure they have built that shape too.
• Make a class collection of structures: take one teamâ€™s collection and ask the other groups to add the structures that are missing. There should be 21 structures all together.

## Look Fors

• What spatial language is being used by the students as they describe the composition of cubes to their partner?
• Can students accurately recognize identical shapes?
• Are students able to recognize shapes that are mirror images of one another?