For KS3 Maths you'll need to understand both imperial and metric units of measurement. Imagine calculating the area of some shapes in metric units like centimetres or metres. Now convert your answers to imperial. How many centimetres make an inch or how many yards in a metre? Hopefully, this quiz will make things simple.

Metric units are all based on powers of ten like 100s or 1,000s. They include metres, kilograms and litres. They're based on decimalsisation because tens are so much easier to work with. The older, and now mostly outdated, imperial system has units such as yards, pounds and pints with seemingly random values. Despite this, the old system is still in use and you will most certainly have come across pounds and ounces, miles or the Fahrenheit temperature scale. It is useful to know some rough metric equivalents of common imperial units. That will make your life so much easier. Here is a list of some approximate equivalent values:

- 1kg = 2.2lb
- 1 litre = 1.75 pints
- 1 gallon = 4.5 litres
- 5 miles = 8km
- 1 inch = 2.54cm
- 1 foot = 30cm
- 12 inches in a foot
- 16 ounces in a pound (lb)
- 14lb in a stone

Now you just need to get some practise. This Maths quiz should help!

1.

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

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.

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

5.

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'

6.

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!

7.

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

8.

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

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