Year 8

# Surface area of cuboids

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## Lesson details

### Key learning points

- In this lesson, we will learn how to calculate the surface area of cuboids.

### Licence

This content is made available by Oak National Academy Limited and its partners and licensed under Oak’s terms & conditions (Collection 1), except where otherwise stated.

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### 5 Questions

Q1.

What is the best mathematical definition of a conjecture?

A fact

A proof

A statement that is always true

Q2.

What is the surface area of this 1cm unit cube?

3 centimetres squared

4 centimetres squared

8 centimetres squared

Q3.

Two 1cm unit cubes have been combined to form the solid shape below. What is the surface area?

12 centimetres squared

18 centimetres squared

6 centimetres squared

Q4.

The pattern is continued so that we have 3 unit cubes stuck together as a stick. What is the surface area?

18 centimetres squared

20 centimetres squared

7 centimetres squared

Q5.

The pattern is continued so that we have 13 unit cubes stuck together as a stick. Which calculation successfully works out the surface area?

4 x 13 - 2

6 x 13

6 x 13 -2

### 6 Questions

Q1.

This net has been drawn on a centimetre grid. What is the surface area of this cuboid?

216 centimetres squared

54 centimetres squared

96 centimetres squared

Q2.

This cuboid is formed by 1cm unit cubes. What is the surface area of this shape?

16 centimetres squared

20 centimetres squared

80 centimetres squared

Q3.

Xavier says to find the surface area of a cuboid you can find the area of the front, side and base, add them together and double it. Do you agree?

No, you cannot work out the surface area of a cuboid like that.

Q4.

Find the surface area of a cube with edges of length 2m

12 metres squared

4 metres squred

8 metres squared

Q5.

Find the surface area of a 1.5m x 2m x 6m cuboid

18 metres squared

24 metres squared

A different number

Q6.

A cube has a volume of 125 cubic centimetres. What is the surface area?

25 centimetres squared

5 centimetres squared

Not enough information given