To convert kgs to tonnes divide by 1000. I've generated some hopefully helpful examples randomly below, as with most random sentences please excuse the repetitive and occasionally comic outcomes.
How many tonnes of barley are there in 940 kgs? Just divide by 1000 to get the answer of 0.94 tonnes.
You have 110 kgs of rye but you need to know how many tonnes that is. To get the answer divide by 1000 which gives you 0.11 tonnes.
To convert 640 kgs into tonnes divide by 1000 giving 0.64 tonnes.
You've got 620 kgs of onions but someone only wants to buy that in units of tonnes, to change the units divide by 1000. Now you have 0.62 tonnes.
In 90 kgs of beetroot there are 0.09 tonnes, to achieve this take 90 and just divide by 1000.