Question

convert the following into kilometres 39.5 cm

Answer 1

1 km has 1000 m

And 1 m has 100 cm

So, 1 km has 100000cm

39.5/100000 = 0.000395km.

Answer 2

Hi Harpreet,

pls dont get confused.

always just remember these
100cm = 1m
1000m = 1km = 1000*100 cm

now just apply above unit coversions
100000cm = 1km
1cm = 1/100000 km
so
39.5cm = 39.5/100000 km
= 0.000395km
= 3.95 * 10^(-4) km

Hope it helped you.
Cheers !!!