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Measuring length

units of Measuring length

Centimetre , metre and kilometre are some standard units of length.

Centimetre Metre Kilometre

• It is the smaller unit • It is another unit of length used to • It is the bigger unit of length
of length used to measure longer lengths. used to measure the bigger
measure shorter • It is denoted by ‘m’. lengths.
lengths. Examples: Length of a cloth, height of • It is denoted by ‘km’.

• It is denoted by ‘cm’. a wall, height of a tree. Example: Distance between
Examples: Length of a two cities.
pencil, length of a crayon,
length of a book.

141 km

6 cm 12 cm 25 cm 2 m 6 m 15 m

Measuring short length

We use a scale to measure the length of an object. The scale has Remember
two types of marks — long marks and short marks. The long marks 1 cm = 10 mm
on the scale are 1 cm apart. Each centimetre is divided into 10

small equal parts called millimetres (mm).

If we want to measure the length of an object like a pencil using a scale, we place the
object alongside the ruler with one end of the object at the zero mark of the ruler as
shown below.

Knowledge Desk
In Ancient time, the popular
measure of length was "Gaz"
2 Hath = 1 Gaz.
We take the reading at the other end of the object. This gives us the length of the object.

The length of the above pencil is 4 cm.

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