Answer:
1000 Grams : 1 Kilogram or 1 Kilogram : 1000 Grams
Explanation:
In the metric system the value of a kilogram is solved like:

When converting from grams to kilograms, we solve it like:

Let's take for example:
2 KG is how many grams?
We use the grams to kilograms formula like so:

Then we end up with:
g = 2000