.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

.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?
.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?

.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