How many 0 are there between 1 to 1000?

Answer 1

When for every 10 numbers, there is one zero.

So between 999/10 = 99 and every 100 numbers, 9 more zero

But then there is 101,102,103, etc. then 201,202,203,etc.

So 9*9=81

Now add those two equations....81+9+99=189