SOLUTION: How many digit are used to write number from 1 to 100.

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Question 999858: How many digit are used to write number from 1 to 100.
Answer by AnlytcPhil(1810)   (Show Source): You can put this solution on YOUR website!
1,2,...,9,10,11,...,99,100

There are 9 1-digit numbers.  That's 9 digits.

There is only 1 3-digit number, which is 100. 
That's 3 more digits.

The other 90 numbers are all two-digit numbers,
   so that's 2×90 or 180 digits.

Total 9+3+180 = 192 digits.

Edwin
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