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Perimeter and Area (Year 4)
Do you know what would be a suitable unit to measure the area of a classroom?

Perimeter and Area (Year 4)

Year 4 perimeter and area introduce measuring the length around shapes and the space inside. Pupils practise solving real-world problems using these important geometry skills.

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Fascinating Fact:

The Great Pyramid of Giza has a square base with a perimeter of over 900 metres.

In KS2 Maths, Year 4 pupils build confidence with perimeter and area. These topics connect maths to real life, from fencing gardens to tiling floors or designing sports pitches.

  • Perimeter: The total distance around the outside of a shape.
  • Area: The amount of space inside a flat, two-dimensional shape.
  • Square unit: A standard measurement used for area, such as square centimetres (cm²).
How do you find the perimeter of a shape?

The perimeter is found by adding the lengths of all the sides of a shape. For rectangles, you add twice the length and twice the width.

How do you work out the area of a rectangle?

The area of a rectangle is found by multiplying its length by its width. The answer is written in square units, such as cm² or m².

Why is learning about perimeter and area important?

Understanding perimeter and area is important for real-life tasks, such as building fences, laying carpets, painting walls, or designing playgrounds and gardens.

1 .
How is square centimetre usually written?
Cm sq
Sq cm
cm2
2cm
Cubed cm are written as cm3
2 .
What is a perimeter?
The distance around the edge of a shape
The distance across a shape
The size of the surface of a 2D shape
The size of the surface of a 3D shape
To calculate the perimeter of a 2D shape, add together the length of each side
3 .
A square has a perimeter of 32cm. How long are the sides?
4cm
8cm
10cm
16cm
As a square has four equal sides, we divide by 4 to get the answer
4 .
What is useful to work out the area of a small 2D shape?
Tracing paper
Measuring jug
Metre stick
Squared paper
Squared paper helps to work out the area of irregular shapes too
5 .
What is the perimeter of a 6cm square?
6cm
12cm
18cm
24cm
A square has four equal sides, therefore the perimeter will be 4 x 6 = 24
6 .
What is the perimeter of a rectangle 5cm x 9cm?
14cm
20cm
28cm
45cm
A rectangle has two sides of equal length and two more side with equal length. So the answer is:
(2 x 5) + (2 x 9) which is
10 + 18 = 28
7 .
Which would be a good estimate of the area of a small notebook?
1,000cm2
5cm2
26cm2
500cm2
This would be a very small notebook measuring 4cm x 6.5cm
8 .
What is area?
The distance around the edge of a 2D shape
The distance across a 2D shape
The size of the surface of a 2D shape
The distance around the edge of a 3D shape
Area is measured in square mm cm m or km
9 .
Which is a good estimate of the perimeter of a mobile 'phone?
100cm
34cm
2m
25mm
100cm = 1m That's way too big for a 'phone!
10 .
Which would be a suitable unit to measure the area of a classroom?
Square metres
Square millimetres
Square centimetres
Square kilograms
Millimetres and centimetres would be way too small and kilograms measure weight!
You can find more about this topic by visiting BBC Bitesize - How to work out an area

Author:  Amanda Swift (Primary School Teacher & Educational Content Developer)

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