It is 4.0 litres.
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4.000which is 8 of half litre0.5 x 8 = 4
When referring to volume measurements, "nearest litre" means rounding the measurement to the nearest whole litre. This involves looking at the decimal portion of the measurement and determining whether it is closer to the previous whole litre or the next whole litre. For example, if a measurement is 3.7 litres, rounding to the nearest litre would result in 4 litres, as 3.7 is closer to 4 than to 3.
1000 millilitres = 1 litre ⇒ 500 millilitres = 500 ÷ 1000 litre = 0.5 litre ⇒ 1 litre 500 millilitre = 1 litre + 0.5 litre = 1.5 litre → 2 litre to the nearest litre.
0.5 litre is half a litre or 500 millilitres.
Nine and one half rounded to the nearest half is nine and one half.