Page 150 - Math Genius C3

E:\Working\Orange_Education\Math_Genius_3\Open_Files\CHAP_09
\ 01-Oct-2025 Bharat Arora Proof-10 Reader’s Sign _______________________ Date __________

Measuring length

units of Measuring length

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

Centimetre Metre Kilometre
• A small unit of • A unit of length used to measure • A large unit of length used to

length used for short longer lengths. measure long distances.
measurements. • It is denoted by ‘m’. • It is denoted by ‘km’.

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

notebook.

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. A scale Math Insight

has two types of marks — long marks and short marks. The 1 cm = 10 mm
long marks on the scale are 1 cm apart. Each centimetre is

divided into 10 small equal parts (short marks) called millimetres (mm).

To measure the length of an object like a pencil using a scale, 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 times, 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 pencil is 4 cm.

148 Mathematics-3