Q.3 (i) Express 5 cm in metre and kilometre.
(ii) Express 35 mm in cm, m and km.


Answer :

(i) 1 metre = 100 cm
1 kilometre = 1000 metre = 100 × 1000 cm = 100000 cm
Therefore 5 cm = 5/100 metre = 0.05 metre
5 cm = 5/100000 km = 0.00005 km
Hence, 5 cm = 0.05 m and 0.00005 km

(ii) 1 cm = 10 mm and 1 km = 100000 cm
Therefore 35 mm = 35/10 cm = 3.5 cm,
35 mm = 35/1000 m = 0.035 m
35 mm = 35/1000000 km = 0.000035 km
Hence, 35 mm = 3.5 cm, 0.035 m and 0.000035 km.

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