Gr 4–6 · 40 min
Area of a net
Coming soon. We're checking this lesson against the app, step by step, so it works when you run it with a class. You can read the plan now. The lesson pack, teaching mode and assigning open once it's checked.
A box's net is six rectangles in three matching pairs: add their areas.
Ontario Gr 4–6 · Spatial Sense E2 · Common Core 4.MD.A.3, 6.G.A.4
Learning goals
- Find the area of each rectangle in a net
- Add the areas to find how much paper covers the box
Plan
- 1
Colour the pairs10 minStudents
Students colour matching faces of the printed net the same colour with coloured pencils. They find three pairs.
- 2
Area of each15 minStudents
Write length × width inside each rectangle using the edge lengths printed on the net.
- 3
Add them up10 minStudents
Add the six areas, or double the three different ones. That's the surface area.
- 4
Build5 minStudents
Fold the box. The paper you covered it with is the area you found.
To talk about
- Why do the faces come in pairs?
- Does the tab paper count? Why not?