4th Class Mathematics Measurement Length, Weight and Capacity Measurement


Category : 4th Class




  • In most of the countries, the metric system of measurement is used.
  • Standard units of measurement (Metric system)



Metre (m)


Kilogram (kg)




  • In the metric system, the standard unit of length is metre. The standard unit of mass is kilogram and the standard unit of volume or capacity is litre.
  • A metre is divided into 100 equal parts called centimetres.    

\[\mathbf{1cm =}\frac{\mathbf{1}}{\mathbf{100}}\mathbf{m = 0}\mathbf{.01m}\]

\[\mathbf{1m =100 cm}\]


  • 1 cm is divided into 10 equal parts called millimetres.


\[\mathbf{1 cm = 10 mm}\]

\[\therefore \] \[\mathbf{1mm=}\frac{\mathbf{1}}{\mathbf{10}}\mathbf{cm=0}\mathbf{.1cm}\]


  • Materials like plywood, laminates, aluminium, tin and stainless steel are available in sheets. Their thickness is expressed in mm.
  • While adding or subtracting, units of the same kind must be grouped together.
  • The units of length we use most often are millimetre, centimetre, metre and kilometre.


\[\mathbf{10 mm = 1cm, 10 cm = 1dm, 10 dm = 1m,}\]\[\mathbf{10m = 1Dm, 10Dm = 1 Hm, 10 Hm = 1Km}\]

\[\mathbf{1000 cm = 1m}\]

\[\mathbf{1000 m = 1km}\]


\[\mathbf{1000 m = 1 km}\]

\[\therefore \]\[\mathbf{1m = }\frac{\mathbf{1}}{\mathbf{1000}}\mathbf{ km = 0}\mathbf{.001 km}\]


  • The mass or quantity of an object is measured in kilograms, grams and milligrams.
  • Large masses are measured in kilograms. 1000 grams make 1 kilogram.
  • Light objects or very small quantities are measured in milligrams. 1000 milligrams make a gram.

\[\mathbf{1000 mg = 1g}\]

\[\mathbf{1000 g = 1 kg}\]

\[\therefore \] \[\mathbf{1g =}\frac{\mathbf{1}}{\mathbf{1000}}\mathbf{ kg = 0}\mathbf{.001 kg}\]


  • The volume or quantity of a liquid is measured in the units of capacity. Smaller quantities are measured in units of millilitres.


\[\therefore \]\[\text{1 m}l\text{ = }\frac{\text{1}}{\text{1000}}\text{ }l\text{ = 0}\text{.001}l\]




Other Topics

Notes - Measurement

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