halb
half
Describes half of something, one of two equal parts.
Ich hätte gern ein halbes Hähnchen mit Pommes.
I'd like half a chicken with fries.

half
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half
Describes half of something, one of two equal parts.
Ich hätte gern ein halbes Hähnchen mit Pommes.
I'd like half a chicken with fries.

'Halb' (half) is declined when it stands as an adjective before a noun. When it describes a verb or another adjective as an adverb, it remains unchanged.
Er hat nur einen halben Apfel gegessen.
He ate only half an apple.
Before geographical names or nouns without an article, 'halb' (half) often stands directly before the word and is not declined.
Halb Deutschland spricht über das Thema.
Half of Germany is talking about the topic.
When telling time, 'halb' always means 30 minutes BEFORE the next full hour. So 'halb neun' is 8:30, not 9:30.
Der Zug fährt um halb drei ab.
The train leaves at half past two.
The expression 'halbe Sachen machen' (to do things by halves) is a fixed expression and means to complete a task incompletely or carelessly.
Wenn du etwas tust, dann richtig. Mach keine halben Sachen!
If you're going to do something, do it properly. Don't do things by halves!
In the meaning of 'fast' (almost) or 'beinahe' (nearly), 'halb' is often used in exaggerated expressions to describe a strong feeling.
Ich habe mich halb totgelacht.
I almost died laughing.
whole / quite
'ganz' and 'halb' are often opposites. 'ganz' means the complete amount or the whole thing. 'halb' means only one half or something that is not complete. The difference is especially important when talking about quantities, parts, or completed tasks. 'Das ganze Brot' is the whole loaf of bread; 'ein halbes Brot' is only half.

Vor dem Training trinkt Max nur ein halbes Glas Wasser.
Before training, Max drinks only half a glass of water.
Ich habe den ganzen Nachmittag im Garten gearbeitet.
I worked in the garden the whole afternoon.