# 4th Class Mathematics Measurement Length, Weight and Capacity Measurement

Measurement

Category : 4th Class

Measurement

Synopsis

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

 Length Metre (m) Mass Kilogram (kg) Capacity Litre

• 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$

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