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

Perimeter and Area (Year 5)

In KS2 Maths, children learn about perimeter and area. In Year Five, they figure out how to find the perimeter of squares and rectangles. Now, they also explore other shapes like pentagons or hexagons and learn to calculate their area. Kids become confident with areas of squares and rectangles, understanding that square metres have 10,000 square cm, and square cm have 100 square mm.

The perimeter is the distance around a shape. To find a hexagon's perimeter, multiply one side's length by 6. For example, if the sides are 2 metres long, the perimeter is 12 metres. Area is like the size of a surface, important for planning how much paint a wall needs. Can you figure out the perimeter of a hexagon?

Test what you know about area and perimeter with this quiz for 9-10 year olds!

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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

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

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

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

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

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!

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

How many cm² is equivalent to 1m²?

10cm²

100cm²

1,000cm²

10,000cm²

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

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

10.

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

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

Author: Amanda Swift

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