Arrange the following lengths in descending order: , , and .
Converting the measurements to the same unit can help us arrange the lengths.
There are in so we multiply the number of kilometres by to convert the first length to metres.
There are in so we divide the number of decimetres by 10 to convert the second length to metres.
There are in , so we divide the number of centimetres by 100 to convert the third length to metres.
, so the lengths arranged in descending order are , , .