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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 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

2 .

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

3 .

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

4 .

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

5 .

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

6 .

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

7 .

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

8 .

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

9 .

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!

10 .

How many cm² is equivalent to 1m²?

10cm²

100cm²

1,000cm²

10,000cm²

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

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

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

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