We're dividing 258837 by 9 
The aim is to understand the frequency of 9 in 258837.

Advancing to step 1:
2 divided by 9 is 0 with a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Bring next digit (5) of the dividend behind the 2 and repeat the process: 25 / 9

Moving on to step 2:
9 goes into 25 2 times with a remainder of 7.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
The remainder is 7 after subtracting 18 from 25.
Grab the next digit (8) from the dividend, add it to 7, then carry on: 78 / 9

Let's proceed to step 3:
When dividing 78 by 9, we get 8 with a remainder of 6.
Use 8 as the next digit of our solution. 
Result so far: 28.0
Deduct 72 from 78 and we're left with 6.
Grab the next digit (8) from the dividend, add it to 6, then carry on: 68 / 9

Advancing to step 4:
The number 9 fits into 68 7 times, leaving a remainder of 5.
Write down 7 as next digit of the result. 
Result so far: 287.0
If we take 63 away from 68, we end up with 5.
Bring next digit (3) of the dividend behind the 5 and repeat the process: 53 / 9

Let's proceed to step 5:
When dividing 53 by 9, we get 5 with a remainder of 8.
Write down 5 as next digit of the result. 
Result so far: 2875.0
The remainder is 8 after subtracting 45 from 53.
Include the next digit (7) from the dividend after 8, then repeat: 87 / 9

On to step 6:
9 can be fit into 87 9 times, resulting in a remainder of 6.
The next digit of our result is 9. 
Result so far: 28759.0
Deduct 81 from 87 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 7:
60 divided by 9 is 6 with a remainder of 6.
Record the quotient 6 as the next digit in the result. 
Result so far: 28759.6
Deduct 54 from 60 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 8:
9 goes into 60 6 times with a remainder of 6.
Use 6 as the next digit of our solution. 
Result so far: 28759.66
The remainder is 6 after subtracting 54 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

After the division, we end up with 28759.66 and a remainder of 0.006.