today we will be learning: to sort 2-d shapes into groups. to recognise and describe 2-d shapes
TRANSCRIPT
Today we will be learning:
• to sort 2-D shapes into groups.
• to recognise and describe 2-D shapes
Mental Activity
We are going to think about 2-D shapes.
How many sides would 4 triangles have?
12
How many straws would I need to make the sides of a square?
4
How many sides would 3 hexagons have?
18
How many sides would 5 squares have?
20
How many straws would I need to make 4 triangles and one pentagon?
17
How many sides would 2 octagons have?
16
We are going to practise counting on in steps of 3.
Start at 0.
We are going to practise counting on in steps of 4.
Start at 2.
We are going to practise counting on in steps of 5.
Start at 1.
Main Activity
Today we are going to sort shapes into groups.
Let’s start by reminding ourselves of some key words to do with shape.
A straight edge is called a side
Where sides meet is called a vertex
The space
between two
meeting lines is
called an
angle
This line is called a
line of symmetry
The space
between two
meeting lines is
called an
angle
What is the name of the angles in this shape?
They are right angles.
We are going to play “What’s my shape?”
Draw the shape as it is described.
You can change your picture at any time.
This shape has 3 vertices (corners).
It has 3 sides.
It has 3 angles. One is a right angle.
The shape is a
right-angled triangle
This shape has 5 sides which are not equal in length.
It has 5 vertices (corners).
It has 5 angles which are not equal.
The shape is an
irregular pentagon
What do these two shapes havein common?
They have 8 sides.
They have 8 angles.
They have 8 vertices.
They have no right angles
They are both octagons.
Group Work
Work with a partner. Choose two 2-D shapes and describe the things they have in common. Sort shapes into groups.