To convert kilograms to grammes multiply by 1000. I've generated some hopefully helpful examples randomly below, as with most random sentences please excuse the repetitive and occasionally comic outcomes.

In 220 kilograms of barley there are 220000 grammes, to achieve this take 220 and just multiply by 1000.

You have 110 kilograms of potatoes but you need to know how many grammes that is. To get the answer multiply by 1000 which gives you 110000 grammes.

To convert 800 kilograms into grammes multiply by 1000 giving 800000 grammes.