No
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number divided by two or half of number
1/2
You can say'A half' or 'one half.' You would use the phrase "a half" Both "a" and "an" are singular articles. If you are referring to only one half, you use "a half". 'A' is usually before words/verbs, unless the word starts with a vowel, then you use 'an'.
5
It means to add half the original length. For example, if a board is two meters long, then one that is "half again as long" would be three meters. The phrase is sometimes used with respect to duration, as well.