To convert tonnes to kilograms 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 70 tonnes of steel there are 70000 kilograms, to achieve this take 70 and just multiply by 1000.

You have 19 tonnes of iron ore252sulphur but you need to know how many kilograms that is. To get the answer multiply by 1000 which gives you 19000 kilograms.

You've got 33 tonnes of coal but someone only wants to buy that in units of kilograms, to change the units multiply by 1000. Now you have 33000 kilograms.

How many kilograms of lead are there in 2 tonnes? Just multiply by 1000 to get the answer of 2000 kilograms.