etymology - Why is it "thirteen" and not "threeteen"?



For example:



fourteen, sixteen, seventeen, eighteen, nineteen



These are all number+teen.


What is wrong with threeteen and fiveteen? Why are 13 and 15 written "differently"? Are they coming from third+teen and fifth+teen? If so, why were d and h removed? What is a "thir" and a "fift"?


I am utterly puzzled.


(not to mention eleven and twelve, which could have been oneteen and twoteen, but has been addressed here)




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