Lesson · Grade 3 · Mathematics
Nets: Folding a Cube, Unfolding a Box
- Grade 3
- Mathematics
- 55 s
- British Columbia
- BC3-MA-28
A flat net of 6 squares is counted, laid on a table, and folded square by square into a cube, so its 6 squares become the cube's 6 faces. Then a closed box opens out into a net of 6 rectangles whose opposite faces match in 3 pairs, before it folds back up to show that a net folds up into a 3D object.
Concept: Nets: unfolding a 3D object
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In one sentence
The question this lesson answers
Can a flat shape fold up into a cube?
This flat shape is called a net.
Transcript
What the lesson says
Can a flat shape fold up into a cube?
This flat shape is called a net.
This net has 6 squares.
Keep the middle square flat and fold up the 4 squares around it.
Fold the last square over the top.
The 6 squares become the 6 faces of a cube.
Now let us unfold a box.
Open the top, then fold the sides down.
A net of the box has 6 rectangles, one for each face.
Opposite faces match, so the 6 rectangles make 3 pairs.
A net is a flat shape that folds up into a 3D object.
Curriculum
Where this fits
- British Columbia, Grade 3
Mathematics, Geometry and measurement: construction of 3D objectsBC3-MA-28
The outcomes and strands follow the British Columbia curriculum.
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