Question

you need half a liter of milk how many millimeters do you need

Answer 1

Well lets look at this

First figure out: How many milliliters are in a liter: 1000

Ok now you need half a liter so how would you figure out how many milliliters that is?

Divide by 2: 1000 ÷ 2 = 500

So 500 milliliters are needed for half a liter