* 1 kilogram (kg) = 1000 grams (g)

* 2 kilograms = 2 * 1000 grams = 2000 grams

Now, to find out how many 500 grams are in 2000 grams:

* 2000 grams / 500 grams/unit = 4 units

Therefore, you need 4 units of 500 grams to equal 2 kilograms.