How to teach geometry

Grade 2 to Grade 6

Primary geometry covers naming and sorting 2D and 3D shapes, then measuring them , perimeter (the distance around a shape) and area (the space inside). Angles and symmetry come in later. It works best when students handle and draw shapes before they calculate anything.

How to teach it

1. Start hands-on: sort real 2D and 3D shapes and name their features (sides, corners, faces, edges).
2. Teach perimeter as 'walking around the edge' , add up all the side lengths.
3. Teach area on a grid first: count the unit squares inside, then discover length x width for rectangles.
4. Keep the units straight , perimeter is in cm, area is in square cm (cm squared).
5. Move on to angles (right, acute, obtuse) and lines of symmetry once shapes and measuring are secure.

Common mistakes

• Mixing up area and perimeter (adding the sides when the question asks for the space inside).
• Forgetting the units, or using cm for area instead of square cm.
• For area, adding length and width instead of multiplying.
• Assuming shapes with the same perimeter have the same area (they often don't).