In a colony a sign maker got the contract to mark the buildings from number 1 to 500. How many zeroes will he need?

Question

A new colony was built and a sign maker got the contract to mark the buildings from number 1 to 500. How many zeroes will he need?

Answer 1

91 using a spread sheet and counting; perhaps a computer program will be more authentic.

Comments

#include<stdio.h>
#include<math.h>

int main()
{
    int a=1,b,count=0;
    float c;
    for(a=1;a<501;a++)
    {
        b=a;
        while(b>0)
        {
            c=fmod(b,10);
            if(c==0)
            {
                count++;
            }
            b=b/10;
        }
    }
   
    printf("%d number of zeros are present between 1 to 500\n",count);
}

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The above code gave the same answer