Eli5: why are 11 and 12 called eleven ant twelve and not oneteen and twoteen?

Question

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In: 4237

Answer 1

the better question is why we label them “teen” at all. twenty one, two, three… are all twenty-X along with thirties, forties, fifties and so on. so, it fallows that the tens should be ten-one, ten-two, ten-thee… etc. or even deca-one, deca-two…