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October 16th, 2011, 02:46 AM  #1 
Member Joined: Oct 2011 Posts: 81 Thanks: 0  What is the method?
How many times 5 is present when we write all natural numbers to 1000 ? what is the method of solving it.?? 
October 16th, 2011, 04:03 AM  #2 
Math Team Joined: Apr 2010 Posts: 2,780 Thanks: 361  Re: What is the method?
The same number of fives as 0 to 999. Write 0 like 000, 1 like 001 etc so every number has 3 digits. Now, there is A total of 3 * 1000 = 3000 digits, of which 10% = 300 are 5. 
October 16th, 2011, 04:48 AM  #3 
Global Moderator Joined: Dec 2006 Posts: 20,370 Thanks: 2007 
There are 300 fives: 100 as the hundreds digit, 100 as the tens digit and 100 as the units digit. How many ones are there?


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