We're dividing 90388135 by 939 
The aim is to understand the frequency of 939 in 90388135.

Advancing to step 1:
The number 939 fits into 9 0 times, leaving a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Include the next digit (0) from the dividend after 9, then repeat: 90 / 939

Step 2:
When dividing 90 by 939, we get 0 with a remainder of 90.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 90 to get 90.
Bring next digit (3) of the dividend behind the 90 and repeat the process: 903 / 939

Moving on to step 3:
When dividing 903 by 939, we get 0 with a remainder of 903.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 903, we get 903.
Bring next digit (8) of the dividend behind the 903 and repeat the process: 9038 / 939

On to step 4:
9038 divided by 939 is 9 with a remainder of 587.
Use 9 as the next digit of our solution. 
Result so far: 9.0
If we take 8451 away from 9038, we end up with 587.
Grab the next digit (8) from the dividend, add it to 587, then carry on: 5878 / 939

Going ahead to step 5:
The number 939 fits into 5878 6 times, leaving a remainder of 244.
The number 6 becomes the next digit in our result. 
Result so far: 96.0
If we take 5634 away from 5878, we end up with 244.
Fetch the next digit (1) from the dividend, attach it to 244 and continue: 2441 / 939

On to step 6:
939 can be fit into 2441 2 times, resulting in a remainder of 563.
Use 2 as the next digit of our solution. 
Result so far: 962.0
The remainder is 563 after subtracting 1878 from 2441.
Append the next digit (3) from the dividend to 563 and continue with: 5633 / 939

Going ahead to step 7:
When dividing 5633 by 939, we get 5 with a remainder of 938.
Record the quotient 5 as the next digit in the result. 
Result so far: 9625.0
The remainder is 938 after subtracting 4695 from 5633.
Append the next digit (5) from the dividend to 938 and continue with: 9385 / 939

On to step 8:
939 goes into 9385 9 times with a remainder of 934.
The number 9 becomes the next digit in our result. 
Result so far: 96259.0
If we subtract 8451 from 9385, we get 934.
Since there are no more digits in the dividend, we add a zero to the remainder making it 9340, and continue the process.

Let's proceed to step 9:
939 can be fit into 9340 9 times, resulting in a remainder of 889.
Put 9 as the next digit of the answer. 
Result so far: 96259.9
Deduct 8451 from 9340 and we're left with 889.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8890, and continue the process.

Advancing to step 10:
939 can be fit into 8890 9 times, resulting in a remainder of 439.
Record the quotient 9 as the next digit in the result. 
Result so far: 96259.99
The remainder is 439 after subtracting 8451 from 8890.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4390, and continue the process.

Our division results in 96259.99 with a remaining 0.439.