The plural for thirteen is thirteens (13s). As in "they are in their thirteens".
The plural is thirteens, but it is only used when referring to the number itself: Addresses with two thirteens might seem unlucky. (1313) We had to count to one hundred and thirty by thirteens.
Six thirteens as a decimal is approximately 0.461538461538.
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Remy Hadley
The plural form of thirteen is thirteens.
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