Half a kilo....
Incorrect : She bought a half kilo of sugar.
Correct : She bought half a kilo of sugar.
Incorrect : The half boys have already turned up.
Correct : Half the boys have already turned up.
Note: "Half” is often used as a predeterminer which comes before the determiners a, an and the. You can, however, say:
I waited a half hour there.
In this sentence, "half” is an adjective, not a predeterminer.
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