In a shop, food tins stand in a tall tower, each tin sitting steady on the one below. Now picture a tower made of footballs. Look and think: what feels different?
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. We place the cube, the sphere, the cuboid, then the cylinder. Before each one moves, think: Stacks well, Rolls, or Both. Then we agree as a class before the shape is moved.
Stacks, rolls or both?
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: ______
Sort each solid together. Flat face or curved face: which job does it do?
Sort the solids
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