How_To_Be_Good_At_Math

191

We can measure the mass

of very light things in an

imperial unit called ounces. This

bird has a mass of 3 ounces.

We can also use pounds to

measure mass. This big cat

has a mass of 18 pounds. There

are 16 ounces in 1 pound.

The imperial ton is used to

measure very heavy things.

There are 2240 pounds in

1 imperial ton. This elephant has

a mass of 3 imperial tons. A very

similar unit is used in the metric

system, called tonnes or metric

tons. It has a slightly different

mass to the imperial ton.

MEASUREMENT • IMPERIAL UNITS OF LENGTH, VOLUME, AND MASS MEASUREMENT • IMPERIAL UNITS OF LENGTH, VOLUME, AND MASS

Imperial and

metric units

Imperial and metric

units aren’t very closely

related. This table

shows the equivalent

measurements in metric

and imperial to give you

an idea of how the units

relate to each other.

Mass

LENGTH

1 inch = 2.54 centimetres 1 centimetre = 0.39 inch

1 foot = 0.30 metres 1 metre = 3.28 feet

1 yard = 0.91 metre 1 metre = 1.09 yards

1 mile = 1.61 kilometres 1 kilometre = 0.62 mile

VOLUME AND CAPACITY

1 pint = 0.57 litre 1 litre = 1.76 pints

1 gallon = 4.55 litres 1 litre = 0.22 gallons

MASS

1 ounce = 28.35 grams 1 gram = 0.04 ounce

1 pound = 0.45 kilogram 1 kilogram = 2.20 pounds

1 imperial ton = 1.02 tonnes 1 tonne = 0.98 imperial ton

190_191_Imperial_units_vollengthmass.indd 191 29/02/2016 18:58