1 gram (1 kilogram/1000 grams)
= 0.001 kilograms
======(1/1000 of a kilogram)
1 grams is equal to how many kilo grams?
The word Kilo is a latin prefix meanning "one thousands"
Hence by reciprocal, one kilogram contains one thosuands of grams
and hence 1 gram is 1/1000th part of a kilo gram