.There are 100 buildings along the street,A sign maker is ordered to number the buildings from one to one hundred,How many "6"s will be need?

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.There are 100 buildings along the street,A sign maker is ordered to number the buildings from one to one hundred,How many "6"s will be need?

有100间房屋沿路排下去...房屋都有一个牌子记录号码从1到100..请问有多少"6"的数字需要