258516 divided by 81 
We want to figure out the number of times 258516 can be divided by 81.

Let's proceed to step 1:
81 can be fit into 2 0 times, resulting in a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Bring next digit (5) of the dividend behind the 2 and repeat the process: 25 / 81

On to step 2:
The number 81 fits into 25 0 times, leaving a remainder of 25.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 25, we get 25.
Fetch the next digit (8) from the dividend, attach it to 25 and continue: 258 / 81

Moving on to step 3:
The number 81 fits into 258 3 times, leaving a remainder of 15.
The next digit of our result is 3. 
Result so far: 3.0
Subtract 243 from 258 to get 15.
Fetch the next digit (5) from the dividend, attach it to 15 and continue: 155 / 81

Step 4:
81 can be fit into 155 1 times, resulting in a remainder of 74.
The next digit of our result is 1. 
Result so far: 31.0
Subtract 81 from 155 to get 74.
Fetch the next digit (1) from the dividend, attach it to 74 and continue: 741 / 81

Step 5:
81 can be fit into 741 9 times, resulting in a remainder of 12.
The number 9 becomes the next digit in our result. 
Result so far: 319.0
If we subtract 729 from 741, we get 12.
Take the next digit (6) from the dividend and append it to 12, then repeat: 126 / 81

Advancing to step 6:
The number 81 fits into 126 1 times, leaving a remainder of 45.
Use 1 as the next digit of our solution. 
Result so far: 3191.0
If we take 81 away from 126, we end up with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Moving on to step 7:
81 goes into 450 5 times with a remainder of 45.
Put 5 as the next digit of the answer. 
Result so far: 3191.5
Deduct 405 from 450 and we're left with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Going ahead to step 8:
If we divide 450 by 81, we get 5 and a remainder of 45.
The next digit of our result is 5. 
Result so far: 3191.55
If we take 405 away from 450, we end up with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

The final result is 3191.55 with a remainder of 0.045.