Question

Arrange the following units in descending order of length.

• A. Kilometre
• B. Decametre
• C. Centimetre
• D. Millimetre

Answer 1

The standard unit for measurement of length is defined as metre. With respect to metre:
1 kilometre = 1000 metres.
1 decametre = 10 metres.
1 centimetre = $\frac{1}{100}=0.01$ metre.
1 millimetre = $\frac{1}{1000}=0.001$ metre.
$\therefore$ In descending order of magnitude:
1 kilometre > 1 decametre > (1 metre) > 1 centimetre > 1 millimetre