3 o'clock or three o'clock


Senior Member
In written English,do people write like:
1. It's three o'clock. Or 2. It's 3 o'clock. Or both are OK.

Another question in written English:
Which of the following questions is right?
1. This is his 5th job. 2. This is his fifth job.
1.This is his 50th birthday. 2. This is his fiftieth birthday.

Sometimes I think English is easy,but sometimes, I think it is so difficult.

Thank you very much for your help.
  • lingobingo

    Senior Member
    English - England
    They’re all correct. But in a book or a formal document, it’s standard practice to write smaller numbers out in full – for example, single-figure numerals, or all numbers smaller than 100, depending on the chosen style.
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