To convert kilos to tons 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.
You've got 730 kilos of onions but someone only wants to buy that in units of tons, to change the units divide by 1000. Now you have 0.73 tons.
In 690 kilos of wheat there are 0.69 tons, to achieve this take 690 and just divide by 1000.
How many tons of oats are there in 670 kilos? Just divide by 1000 to get the answer of 0.67 tons.
To convert 300 kilos into tons divide by 1000 giving 0.3 tons.