To convert kilogrammes to grams 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.

To convert 680 kilogrammes into grams multiply by 1000 giving 680000 grams.

How many grams of sugarbeet are there in 850 kilogrammes? Just multiply by 1000 to get the answer of 850000 grams.

You've got 320 kilogrammes of oats but someone only wants to buy that in units of grams, to change the units multiply by 1000. Now you have 320000 grams.

You have 720 kilogrammes of rye but you need to know how many grams that is. To get the answer multiply by 1000 which gives you 720000 grams.