Question

convert millimeters into kilometers. Which operation should he choose?

Answer 1

1 mm = 10-6km

in 1 km 100000 cm

and in 1cm 10mm

so in 1mm =1/1000000km

Answer 2

1km=1lakh cms
1cm=10 mms
1km=10mms * 100000cms
=1000000mms
so, one kilometer is equals to ten lakh millimeters.

( 1km=1000000mms )