MEASUREMENT • THE VOLUMES OF SOLIDS MEASUREMENT • WORKING OUT VOLUME WITH A FORMULA 181
The volume of a cuboid can
be written like this:
Volume of a cuboid =
length x width x height
Let’s work out the volume of
this cereal packet.
First, we multiply the length by
the width: 24 x 8 = 192
The volume of
a cube or cuboid is:
length × width × height
LENGTH
24 cm
WIDTH8 cm
HEIGHT^30
cm
Working out volume
with a formula
There is an easier way to work out the volumes of simple shapes
like cuboids without having to count cubes. Instead, we can use a
formula, calculating the number of units rather than counting them.
TRY IT OUT
Small things in big packages
This robot is going to cram a cardboard box
full of 1 cm³ dice. The box has a volume of
1m³. Can you work out how many dice will
fit in the box using the formula? You might
be surprised! Before you start your
calculation, remember to convert the
dimensions of the box into centimetres.
Next, we multiply the result by
the height: 192 x 30 = 5760
This means that the volume
of the packet is 5760 cm³.
Answer on page 319
1 m 1 m
1 m
180_181_Volume_of_Solids.indd 181 29/02/2016 18:04