In KS2 Maths children will come to understand perimeter and area. In Year Five children should know how to work out the perimeter of squares and rectangles and will now be introduced to other regular shapes like a pentagon or a hexagon and shown how to calculate its area. They should be confident when working out the area of squares and rectangles and they will also be expected to know that square metres contain 10,000 square cm and that square cm contain 100 square mm.

The perimeter of a shape is the distance around its edge. To work out the perimeter of a hexagon multiply the length of one of its sides by 6. If its sides are 2 metres long its perimeter would be 12 metres. The area is the size of the surface. Knowing the area of a wall is important if you are planning to give it a lick of paint - otherwise how will you know how many tins of paint to buy?!

Can you work out the perimeter of a hexagon? Find out what you know about area and perimeter by taking this quiz for 9-10 year olds.

1.

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

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.

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!

4.

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

38 - 14 = 24

24 ÷ 2 = 12

5.

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

1,000mm^{2}

100mm^{2}

10m^{2}

100m^{2}

10m^{2} would be large enough for a room in a house but not big enough for a classroom

6.

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 70cm^{2}

7.

How many cm^{2} is equivalent to 1m^{2}?

10cm^{2}

100cm^{2}

1,000cm^{2}

10,000cm^{2}

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.

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

10.

Which would be best measured in cm^{2}?

Area of a playground

Area of a town

Area of a desk top

Area of a pen tip

Towns might be measured in km^{2}, playgrounds in m^{2} and pen tips in mm^{2}