In a shop, food tins stand in a tall tower, each tin sitting steady on the one below. Now imagine a tower made of footballs. How would that stack?
Four solid shapes are ready. A solid shape is one you can hold, not a flat drawing on paper.
Watch each shape. Before it moves, look: is it resting on a flat face, or is every side curved?
When a shape sits still on a flat face so you can build a tower, we say it stacks.
When a shape moves away because it has a curved face and no flat face to rest on, we say it rolls.
When a shape can sit still on flat ends and also move on its curved side, we say it does both.
Today we sort solid shapes by what they can do. First the cube, the sphere, the cuboid and the cylinder, and then some things from the shop. Before each one moves, think: Stacks well, Rolls, or Both. Then we agree as a class before the shape is moved.
Sort the solids
In your maths copy, write one solid that stacks and one solid that rolls.
Word bank on the board: cube, sphere, cuboid, cylinder.
Stacks: ______ Rolls: ______
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