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What would be a suitable unit to measure the area of a chunk of chocolate?

Perimeter and Area (Year 5)

Year 5 perimeter and area explore measuring the outside edges and inside space of shapes. Pupils practise applying these skills to solve everyday and mathematical problems.

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Fascinating Fact:

The surface area of the Moon is about 38 million km², which is smaller than the total area of Asia.

In KS2 Maths, Year 5 pupils develop their understanding of perimeter and area by working with rectangles, compound shapes, and word problems. These skills link maths directly to real-life applications.

Key Terms

Compound shape: A shape made up of two or more simple shapes, such as rectangles or triangles.
Perimeter: The total distance around the outside of a shape, measured by adding all its sides.
Area: The size of the surface inside a flat, two-dimensional shape, measured in square units.

Frequently Asked Questions (Click to see answers)

What is the difference between area and perimeter?

Area measures the space inside a shape, while perimeter measures the distance around its outside edges. Both use different units, like cm² for area and cm for perimeter.

How do you find the perimeter of a compound shape?

To find the perimeter of a compound shape, measure each outside edge and add them together. Ensure you only count the outer sides, not internal lines.

How do you calculate the area of a rectangle?

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

Try These Related Quizzes

1 .

A regular hexagon has a perimeter of 54cm. What is the length of the sides?

6cm

9cm

12cm

20cm

A regular hexagon has 6 equal sides. To calculate the length of each side, divide the perimeter by 6

2 .

What is the formula for calculating the perimeter of a regular hexagon?

4 x length of side

6 x length of side

6 x length + width

Length of side divided by 6

As a regular hexagon has 6 equal sides, just multiply the length of the sides by 6

3 .

A rectangle has a perimeter of 38cm. The shortest sides are 7cm. What length are the two longest sides?

12cm

14cm

21cm

28cm

2 x 7 = 14
38 - 14 = 24
24 ÷ 2 = 12

4 .

Which would be best measured in cm²?

Area of a playground

Area of a town

Area of a desk top

Area of a pen tip

Towns might be measured in km², playgrounds in m² and pen tips in mm²

5 .

What is the formula for calculating the area of a rectangle?

2 x length x 2 x width

2 x length + 2 x width

Length + width

Length x width

If a rectangle measured 7cm by 10cm its area would be 70cm²

6 .

Which would be a good estimate of the area of a classroom?

1,000mm²

100mm²

10m²

100m²

10m² would be large enough for a room in a house but not big enough for a classroom

7 .

How many cm² is equivalent to 1m²?

10cm²

100cm²

1,000cm²

10,000cm²

There are 100cm in 1m so 100 x 100 = 10,000

8 .

What is the perimeter of a regular pentagon with sides of 5cm?

24cm

100cm

10cm

25cm

A pentagon has 5 sides, therefore 5 x 5cm will give you the perimeter

9 .

What is the formula for calculating the perimeter of a rectangle?

2 x length x 2 x width

2 x length + 2 x width

Length + width

Length x width

2 sides of a rectangle are one length whilst the other two sides are a different length, for example 2 sides are 4cm long and the other 2 sides are 6cm long. This rectangle would have a perimeter of 20cm

10 .

Which would be a suitable unit to measure the area of a chunk of chocolate?

Square grams

Square metres

Square millimetres

Square millilitres

Grams measure weight and millilitres measure volume. Square metres measure area but chocolate bars aren't that big!

You can find more about this topic by visiting BBC Bitesize - What is the perimeter?

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