If you say the entire number properly, i.e. "twelve" or "thirteen", there is less chance of the scorer marking the foul down for the wrong player, such as number 1. While I agree that it's not a factor on 14 (the scorer might act on just hearing the first part of the number which is a number itself), since it is a factor on all the other numbers it's best to be consistent.
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Yom HaShoah
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