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Today we will be learning

to recognise and describe 2-D shapes.

A 2-D shape is a flat shape.

Excuse me, but what is a 2-D shape?

Mental Activity

Practise subtraction facts to 20.

Work out the answer before the question disappears.

19-10

18 minus 9

15 - 65 less

than 12

16 subtract 8

11-7

14 minus 7

20 - 1613 less than 20

20 subtract 11

Try subtractions using number lines.

Top Tip

Don’t forget to count on to the nearest multiple of 10.

24 36Where shall we jump to first?

30

36 – 24 =

Now we can jump to 36.

6 + 6 =

66

How many have we counted on altogether?

12

12

26 40

Where shall we jump to first?

30

45 – 26 =

Now where shall we jump?

104

45

5

How many from 40 to 45?

194 + 10 + 5 =

19

Can you think of a quick way to do this?

45 – 19 =

19 is near to 20.

45 – 20 = 25

25 + 1 =26

Main Activity

Today we will be naming and describing shapes.

Name this shape!

Circle

And this?

Square

What about this?

Triangle

Can you name this one?

Rectangle

And this?

Hexagon

Try this.

Pentagon

Do you know this one?

Octagon

What about this one?

Semicircle

What do all these shapes have in common?

They are all 2–D or plane shapes.

All 2-D shapes are flat.

They all have height and width.

3-D shapes all have

height, width and depth.

What is this shape called?

A triangle.

How many sides does it have?

How many angles does it have?

A vertex is the meeting point of two lines.

The two lines form an angle.

How many vertices does this triangle have?

Top Tip

All triangles have three sides.

All triangles have three angles.

All triangles have three vertices.

Group Work

Playing a shape guessing game with a partner.

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