• “.5” when writing and “point five” when speaking
• “0.5” when writing and “point five” when speaking
• “0.5” when writing and “zero point five” when speaking
• “.5” when writing and “zero point five” when speaking
• “0⋅5” when writing and “point five” when speaking
• “0⋅5” when writing and “zero point five” when speaking
• “0,5” when writing
• something else, shamelessly
• something else, with a sense of shame

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