When referring to time, writers must use "9 o'clock" instead of "nine o'clock" for greater formality but less emphasis.

Name: When referring to time, writers must use "9 o'clock" instead of "nine o'clock" for greater formality but less emphasis.
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Question

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Using "nine o'clock" instead of "9 o'clock" is considered more formal and traditional in writing, not the other way around. Numerical representations are often seen as less formal.

When Referring to Time, Writers Must Use "9 O'clock" Instead