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Let's Sort Shapes and Objects

Today I will be... Using my reasoning skills to compare and discuss 2-D and 3-D shapes

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Which of these words could we use to describe 2-D shapes?

Which of these words could we use to describe 3-D shapes?

Think, pair, then share your answers.

sides

cornerspolygon

quadrilateral

regular

irregular edges

faces

verticespolyhedron

pyramidprism

Mental Oral Starter

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What is similar

about these two shapes?

What is different

about these two shapes?

Think, pair, then share your ideas.

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They are both 2-D shapes.

They are both regular polygons.

One shape is a quadrilateral.

They have a different number

of sides and corners.

Did you notice any other similarities or differences?

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What is similar

about these two shapes?

What is different

about these two shapes?

Think, pair, then share your ideas.

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They are both 3-D shapes.

They are both prisms.

The shapes have a different number

of faces, edges and vertices.

Did you notice any other similarities or differences?

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What is similar

about these two shapes?

What is different

about these two shapes?

Think, pair, then share your ideas.

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They are both 2-D shapes.

They are both octagons.

One shape is regular,

and one shape is irregular.

Did you notice any other similarities or differences?

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What is similar

about these two shapes?

What is different

about these two shapes?

Think, pair, then share your ideas.

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They are both 3-D shapes.

Only one shape is a polyhedron.

One shape has a curved face and

edge.

Did you notice any other similarities or differences?

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A hexagon has six sides that are equal in length.

Is this always, sometimes

or never true?

Think, pair, then share your ideas.

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A hexagon has six sides that are equal in length.

It is sometimes true!

A hexagon always has six sides, but they are not

always the same length.

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A prism has two opposite ends that are the same shape and size.

Is this always, sometimes

or never true?

Think, pair, then share your ideas.

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A prism has two opposite ends that are the same shape and size.

It is always true.

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A polygon can have curved sides.

Is this always, sometimes

or never true?

Think, pair, then share your ideas.

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A polygon can have curved sides.

It is never true!

The definition of a polygon is a 2-D shape that has

three or more straight sides.

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Challenge!

Can you make up a sentence about a cuboid that is always true?

Can you make up a sentence about a cuboid that is sometimes true?

Can you make up a sentence about a cuboid that is never true?

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Now it is time to put your shape knowledge

to the test in your independent activities!

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Plenary

Who is right and how do you know?

These 2-D shapes are the faces of a

pentagonal prism.

These 2-D shapes are the faces of a

pentagonal-based pyramid.

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Plenary

These 2-D shapes are the faces of a

pentagonal-based pyramid.

A pentagonal pyramid has one pentagonal-shaped face, and five

triangular-shaped faces.