Consider the number 3205.442
We have to round this number to the greatest non zero place.
The greatest non zero number in the number 3205.442 is 5.
The digit '5' in the given number is at ones place.
So, we will round the number 3205.442 to the nearest ones place.
Since, the number after the ones place that is tenths place is '4', which is less than 5.
So, the number will round to 3205.
Therefore, the number 3205.442 rounded to the greatest non zero place is 3205.