Incorrect spelling, explanation: even though 3rd or even 23rd is correct,
13rd is not. This is caused by the fact that the ordinal number from three is third, but this does not apply with 13, which ends in teen, not a specific number. All teen numbers end with a -th ordinal suffix. What is more, thirteenrd seems unspeakable. Thirteenth is the correct choice.
Correct spelling, explanation: 13th or thirteenth is the correct version. In general, the suffix -th is the most popular when creating an ordinal suffix. There are exceptions, such as 3rd (third), but in the case of all the teen numbers, -th is the only functioning suffix.
Definition of 13th:
1. ordinal number of 13; on a position 13.
I’m not superstitious but I’m always looking out for bad luck on Friday the 13th.
The 13th Art Exhibition kicks off in Prague this week.
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