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A Formula One race must exceed 305 kilometres. Approximately how far is this in miles?

Level 3-4 Shapes - Imperial and Metric

Compare imperial and metric units. Practise converting lengths, masses, and capacities using clear steps and smart conversion factors so mental maths stays quick, accurate, and reliable.

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Fascinating Fact:

In the imperial system, converting units can be trickier, since 16 ounces make a pound and 14 pounds make a stone.

In KS3 Maths, you compare imperial and metric units and convert between them. You will meet common pairs such as inches to centimetres, miles to kilometres, and pints to litres, then choose sensible methods for real problems.

Key Terms

Imperial units: Older units used in the UK and USA, for example inches, feet, miles, ounces, and pints.
Metric units: Decimal units based on tens, for example millimetres, centimetres, metres, kilometres, grams, and litres.
Conversion factor: A number you multiply or divide by to change from one unit to another.

Frequently Asked Questions (Click to see answers)

How do I convert inches to centimetres quickly?

Multiply inches by 2.54 to get centimetres. For a quick estimate, multiply by 2.5, then add a little. Example: 8 inches × 2.54 = 20.32 cm.

What is the easiest way to change miles to kilometres?

Multiply miles by 1.6 for a good estimate or by 1.609 for accuracy. Example: 5 miles ≈ 8 km, exactly 8.045 km with 1.609.

When should I use metric instead of imperial in the UK?

Use metric for science and most measurements at school and in shops. Imperial is still common for road distances in miles and some body measures.

Try These Related Quizzes

1 .

An imperial gallon of petrol contains approximately how many litres?

1.6

4.5

5.4

6.1

An American gallon is only equal to 3.78 L!

2 .

One yard equals three feet. How many inches are approximately equal to one metre?

30 inches

33 inches

36 inches

39 inches

A metre is about 3.25 yards

3 .

Adam is 6 feet 4 inches tall, approximately how tall is he in metres and centimetres?

1 m 64 cm

1 m 80 cm

1 m 90 cm

2 m 10 cm

1 foot contains 12 inches. 1 inch equals approximately 2.5 cm

4 .

Choose the largest drink from the following.

1 gallon of orange juice

1 pint of milk

1 litre of water

2,000 ml of tea

Remember this phrase: 'A litre of water is a pint and three quarters'

5 .

A fuel tank holds 45 litres. Approximately how many pints will it hold?

40 pints

80 pints

120 pints

160 pints

A gallon of water weighs approximately 10 pounds

6 .

A Formula One race must exceed 305 kilometres. Approximately how far is this in miles?

90 miles

190 miles

290 miles

390 miles

There are approximately 1.6 kilometres in a mile

7 .

Which is further: 10 miles or 10 kilometres?

10 kilometres

10 miles

They are the same

None of the above

One mile is approximately equal to 1.6 kilometres

8 .

Which is the largest weight of the following?

2 kg

7 lbs

1,860 g

17 oz

1 kg is approximately equal to 2.2 lbs. 'lbs' means pounds

9 .

John buys 10 kilograms of potatoes. Approximately how much does he have to carry home in ounces?

253 ounces

352 ounces

523 ounces

532 ounces

1 kilogram equals approximately 2.2 pounds and 1 pound equals 16 ounces

10 .

An ounce weighs approximately how many grams (g)?

2.8 g

8.2 g

28 g

82 g

So, a quarter of an ounce would be 7g

You can find more about this topic by visiting BBC Bitesize - Imperial to metric

Author: Frank Evans (Specialist 11 Plus Teacher and Tutor)

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