1,000 ml is 1 litre
1/1000
That is 1/100 - or a centilitre
290/1000 which can be simplified if required.
It is exactly equivalent to one thousandth of a litre
There are 1,000 ml in 1 litre, so obviously ml are smaller.
100 ml is 1/10 of a litre.
500 ml is 1/2 of a litre.
It is 1/1000.
1/5
1/100
the answer is 1/1000