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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.
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