258539 ÷ 90 
We want to figure out the number of times 258539 can be divided by 90.

Going ahead to step 1:
The number 90 fits into 2 0 times, leaving a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Bring next digit (5) of the dividend behind the 2 and repeat the process: 25 / 90

Advancing to step 2:
When dividing 25 by 90, we get 0 with a remainder of 25.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 25 to get 25.
Bring next digit (8) of the dividend behind the 25 and repeat the process: 258 / 90

Let's proceed to step 3:
90 can be fit into 258 2 times, resulting in a remainder of 78.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Subtract 180 from 258 to get 78.
Include the next digit (5) from the dividend after 78, then repeat: 785 / 90

Moving on to step 4:
90 goes into 785 8 times with a remainder of 65.
Put 8 as the next digit of the answer. 
Result so far: 28.0
Subtract 720 from 785 to get 65.
Take the next digit (3) from the dividend and append it to 65, then repeat: 653 / 90

Step 5:
90 goes into 653 7 times with a remainder of 23.
Use 7 as the next digit of our solution. 
Result so far: 287.0
The remainder is 23 after subtracting 630 from 653.
Append the next digit (9) from the dividend to 23 and continue with: 239 / 90

On to step 6:
239 divided by 90 is 2 with a remainder of 59.
Write down 2 as next digit of the result. 
Result so far: 2872.0
Subtract 180 from 239 to get 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

On to step 7:
590 divided by 90 is 6 with a remainder of 50.
The next digit of our result is 6. 
Result so far: 2872.6
If we subtract 540 from 590, we get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Let's proceed to step 8:
90 can be fit into 500 5 times, resulting in a remainder of 50.
Put 5 as the next digit of the answer. 
Result so far: 2872.65
If we subtract 450 from 500, we get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Moving on to step 9:
If we divide 500 by 90, we get 5 and a remainder of 50.
Record the quotient 5 as the next digit in the result. 
Result so far: 2872.655
If we take 450 away from 500, we end up with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

After the division, we end up with 2872.655 and a remainder of 0.005.