To convert kilos 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 oats are there in 100 kilos? Just divide by 1000 to get the answer of 0.1 tonnes.

You've got 710 kilos of beetroot but someone only wants to buy that in units of tonnes, to change the units divide by 1000. Now you have 0.71 tonnes.

To convert 640 kilos into tonnes divide by 1000 giving 0.64 tonnes.

In 470 kilos of sugarbeet there are 0.47 tonnes, to achieve this take 470 and just divide by 1000.