We look at the division of 91459575 by 599 
The aim is to understand the frequency of 599 in 91459575.

Moving on to step 1:
When dividing 9 by 599, we get 0 with a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 9, we end up with 9.
Append the next digit (1) from the dividend to 9 and continue with: 91 / 599

Step 2:
If we divide 91 by 599, we get 0 and a remainder of 91.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 91, we end up with 91.
Include the next digit (4) from the dividend after 91, then repeat: 914 / 599

Let's proceed to step 3:
599 goes into 914 1 times with a remainder of 315.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we subtract 599 from 914, we get 315.
Grab the next digit (5) from the dividend, add it to 315, then carry on: 3155 / 599

Moving on to step 4:
When dividing 3155 by 599, we get 5 with a remainder of 160.
Write down 5 as next digit of the result. 
Result so far: 15.0
Subtract 2995 from 3155 to get 160.
Append the next digit (9) from the dividend to 160 and continue with: 1609 / 599

Let's proceed to step 5:
599 goes into 1609 2 times with a remainder of 411.
The next digit of our result is 2. 
Result so far: 152.0
If we take 1198 away from 1609, we end up with 411.
Bring next digit (5) of the dividend behind the 411 and repeat the process: 4115 / 599

Let's proceed to step 6:
The number 599 fits into 4115 6 times, leaving a remainder of 521.
Put 6 as the next digit of the answer. 
Result so far: 1526.0
Deduct 3594 from 4115 and we're left with 521.
Bring next digit (7) of the dividend behind the 521 and repeat the process: 5217 / 599

Let's proceed to step 7:
The number 599 fits into 5217 8 times, leaving a remainder of 425.
Put 8 as the next digit of the answer. 
Result so far: 15268.0
If we subtract 4792 from 5217, we get 425.
Bring next digit (5) of the dividend behind the 425 and repeat the process: 4255 / 599

Moving on to step 8:
If we divide 4255 by 599, we get 7 and a remainder of 62.
Use 7 as the next digit of our solution. 
Result so far: 152687.0
If we take 4193 away from 4255, we end up with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Step 9:
When dividing 620 by 599, we get 1 with a remainder of 21.
The next digit of our result is 1. 
Result so far: 152687.1
If we subtract 599 from 620, we get 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Advancing to step 10:
599 can be fit into 210 0 times, resulting in a remainder of 210.
Record the quotient 0 as the next digit in the result. 
Result so far: 152687.1
If we take 0 away from 210, we end up with 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2100, and continue the process.

Moving on to step 11:
599 can be fit into 2100 3 times, resulting in a remainder of 303.
Put 3 as the next digit of the answer. 
Result so far: 152687.103
If we subtract 1797 from 2100, we get 303.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3030, and continue the process.

On to step 12:
3030 divided by 599 is 5 with a remainder of 35.
The number 5 becomes the next digit in our result. 
Result so far: 152687.1035
Deduct 2995 from 3030 and we're left with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

On to step 13:
If we divide 350 by 599, we get 0 and a remainder of 350.
Use 0 as the next digit of our solution. 
Result so far: 152687.1035
Subtract 0 from 350 to get 350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3500, and continue the process.

Going ahead to step 14:
3500 divided by 599 is 5 with a remainder of 505.
The number 5 becomes the next digit in our result. 
Result so far: 152687.103505
Subtract 2995 from 3500 to get 505.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5050, and continue the process.

On to step 15:
If we divide 5050 by 599, we get 8 and a remainder of 258.
The number 8 becomes the next digit in our result. 
Result so far: 152687.1035058
If we subtract 4792 from 5050, we get 258.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2580, and continue the process.

Let's proceed to step 16:
If we divide 2580 by 599, we get 4 and a remainder of 184.
Write down 4 as next digit of the result. 
Result so far: 152687.10350584
Subtracting 2396 from 2580 leaves us with 184.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1840, and continue the process.

After the division, we end up with 152687.10350584 and a remainder of 1.84e-07.