Page 125 - New Medley 4 Semester 2 PDF (Merged)

Units of Length

We have learnt the three units of length. The unit metre (m) is the
standard unit of length. We measure the length or distance using the
metre rod and measuring tape. The unit metre is divided into 100 equal

parts. The length of each part is 1 centimetre (cm).

A metre rod

i.e., 1 m = 100 cm

1
or 1 cm = m = 0.01 m
100

Further, each centimetre is sub-divided into 10 equal parts. Each part

represents a millimetre (mm). We have a 15 cm ruler in our geometry box.

1 cm or 10 mm

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Centimetres
SCALE 2 1 Inches 0

5
6
3
4
1
Thus, we observe 1 cm = 10 mm or 1 mm = cm = 0.1 cm
10
The unit kilometre (km) is the bigger unit of length. It is used to measure
large distance. It is 1000 times bigger than a metre.

i.e., 1 km = 1000 m

1
or 1 m = km = 0.001 km
1000

Units of Weight

We are familiar with two units of mass—gram (g) and kilogram (kg). The
gram is used to measure small or light masses and the kilogram is used

to measure large or heavy masses. A kilogram is 1000 times bigger than
a gram.
1
Thus, 1 kg = 1000 g or 1 g = kg = 0.001 kg
1000

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