Some units are metric and some are imperial.

Metric units include kilometres, metres and centimetres.
Imperial units include miles, yards and feet.

Some information about these units is shown below.

a) Work out how many centimetres there are in 57 metres.
b) Work out how many feet there are in 57 yards.
c) Metric units are used by over 90% of countries in the world. Write a sentence to explain why this might be.

Metric units
1 kilometre = 1000 metres
1 metre = 100 centimetres

Imperial units
1 mile = 1760 yards
1 yard = 3 feet

To convert between metric and imperial units, you need to use appropriate conversion factors. Metric units are widely used due to their simplicity and consistency in measuring.

Explanation:

a) To convert metres to centimetres, you need to multiply the value in metres by 100. So, to find out how many centimetres there are in 57 metres, you would multiply 57 by 100. The answer is 5700 centimetres.

b) To convert yards to feet, you need to multiply the value in yards by 3. So, to find out how many feet there are in 57 yards, you would multiply 57 by 3. The answer is 171 feet.

c) Metric units are used by over 90% of countries in the world because the metric system is based on powers of 10 and offers a more straightforward and consistent way of measuring. This makes it easier for people from different countries to communicate and understand measurements without having to convert between different units.

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