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.
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 team’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?