Question 857951
The prefix "kilo" means one thousand (1,000),
so 1 kilometer is 1,000 meters
The prefix "milli" means {{{1/1000}}}
so there are 1,000 millimeters in 1 meter,
and in 1 kilometerr there are
(1,000)(1,000) millimeters = 1,000,000 millimeters