My Math Forum What is the method?

 Elementary Math Fractions, Percentages, Word Problems, Equations, Inequations, Factorization, Expansion

 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: 20,629 Thanks: 2077 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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