We look at the division of 86848239 by 90 
The aim is to understand the frequency of 90 in 86848239.

Moving on to step 1:
90 can be fit into 8 0 times, resulting in a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Grab the next digit (6) from the dividend, add it to 8, then carry on: 86 / 90

Step 2:
The number 90 fits into 86 0 times, leaving a remainder of 86.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 86, we get 86.
Grab the next digit (8) from the dividend, add it to 86, then carry on: 868 / 90

Step 3:
When dividing 868 by 90, we get 9 with a remainder of 58.
Put 9 as the next digit of the answer. 
Result so far: 9.0
If we subtract 810 from 868, we get 58.
Include the next digit (4) from the dividend after 58, then repeat: 584 / 90

Going ahead to step 4:
The number 90 fits into 584 6 times, leaving a remainder of 44.
Use 6 as the next digit of our solution. 
Result so far: 96.0
Subtract 540 from 584 to get 44.
Bring next digit (8) of the dividend behind the 44 and repeat the process: 448 / 90

On to step 5:
90 goes into 448 4 times with a remainder of 88.
Write down 4 as next digit of the result. 
Result so far: 964.0
Subtracting 360 from 448 leaves us with 88.
Fetch the next digit (2) from the dividend, attach it to 88 and continue: 882 / 90

Advancing to step 6:
882 divided by 90 is 9 with a remainder of 72.
The next digit of our result is 9. 
Result so far: 9649.0
Deduct 810 from 882 and we're left with 72.
Append the next digit (3) from the dividend to 72 and continue with: 723 / 90

Going ahead to step 7:
If we divide 723 by 90, we get 8 and a remainder of 3.
Put 8 as the next digit of the answer. 
Result so far: 96498.0
Subtract 720 from 723 to get 3.
Take the next digit (9) from the dividend and append it to 3, then repeat: 39 / 90

Advancing to step 8:
90 goes into 39 0 times with a remainder of 39.
Record the quotient 0 as the next digit in the result. 
Result so far: 964980.0
Deduct 0 from 39 and we're left with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Going ahead to step 9:
90 goes into 390 4 times with a remainder of 30.
Put 4 as the next digit of the answer. 
Result so far: 964980.4
Deduct 360 from 390 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

On to step 10:
The number 90 fits into 300 3 times, leaving a remainder of 30.
Write down 3 as next digit of the result. 
Result so far: 964980.43
Subtract 270 from 300 to get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Let's proceed to step 11:
If we divide 300 by 90, we get 3 and a remainder of 30.
The number 3 becomes the next digit in our result. 
Result so far: 964980.433
If we subtract 270 from 300, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

After the division, we end up with 964980.433 and a remainder of 0.003.