We look at the division of 43452331 by 599 
The aim is to understand the frequency of 599 in 43452331.

Advancing to step 1:
When dividing 4 by 599, we get 0 with a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 4, we get 4.
Include the next digit (3) from the dividend after 4, then repeat: 43 / 599

On to step 2:
43 divided by 599 is 0 with a remainder of 43.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 43, we get 43.
Bring next digit (4) of the dividend behind the 43 and repeat the process: 434 / 599

On to step 3:
434 divided by 599 is 0 with a remainder of 434.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 434 and we're left with 434.
Bring next digit (5) of the dividend behind the 434 and repeat the process: 4345 / 599

Step 4:
If we divide 4345 by 599, we get 7 and a remainder of 152.
Write down 7 as next digit of the result. 
Result so far: 7.0
If we take 4193 away from 4345, we end up with 152.
Take the next digit (2) from the dividend and append it to 152, then repeat: 1522 / 599

Advancing to step 5:
If we divide 1522 by 599, we get 2 and a remainder of 324.
Use 2 as the next digit of our solution. 
Result so far: 72.0
Deduct 1198 from 1522 and we're left with 324.
Bring next digit (3) of the dividend behind the 324 and repeat the process: 3243 / 599

Advancing to step 6:
599 can be fit into 3243 5 times, resulting in a remainder of 248.
Write down 5 as next digit of the result. 
Result so far: 725.0
Deduct 2995 from 3243 and we're left with 248.
Append the next digit (3) from the dividend to 248 and continue with: 2483 / 599

Advancing to step 7:
599 goes into 2483 4 times with a remainder of 87.
Write down 4 as next digit of the result. 
Result so far: 7254.0
Subtracting 2396 from 2483 leaves us with 87.
Bring next digit (1) of the dividend behind the 87 and repeat the process: 871 / 599

Step 8:
599 can be fit into 871 1 times, resulting in a remainder of 272.
Use 1 as the next digit of our solution. 
Result so far: 72541.0
The remainder is 272 after subtracting 599 from 871.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2720, and continue the process.

Step 9:
If we divide 2720 by 599, we get 4 and a remainder of 324.
Put 4 as the next digit of the answer. 
Result so far: 72541.4
If we take 2396 away from 2720, we end up with 324.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3240, and continue the process.

Advancing to step 10:
599 goes into 3240 5 times with a remainder of 245.
The next digit of our result is 5. 
Result so far: 72541.45
Deduct 2995 from 3240 and we're left with 245.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2450, and continue the process.

On to step 11:
2450 divided by 599 is 4 with a remainder of 54.
Write down 4 as next digit of the result. 
Result so far: 72541.454
If we take 2396 away from 2450, we end up with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Advancing to step 12:
If we divide 540 by 599, we get 0 and a remainder of 540.
Use 0 as the next digit of our solution. 
Result so far: 72541.454
Subtract 0 from 540 to get 540.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5400, and continue the process.

Step 13:
If we divide 5400 by 599, we get 9 and a remainder of 9.
Put 9 as the next digit of the answer. 
Result so far: 72541.45409
The remainder is 9 after subtracting 5391 from 5400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Going ahead to step 14:
If we divide 90 by 599, we get 0 and a remainder of 90.
Record the quotient 0 as the next digit in the result. 
Result so far: 72541.45409
Subtracting 0 from 90 leaves us with 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

Let's proceed to step 15:
If we divide 900 by 599, we get 1 and a remainder of 301.
The next digit of our result is 1. 
Result so far: 72541.4540901
If we subtract 599 from 900, we get 301.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3010, and continue the process.

Moving on to step 16:
If we divide 3010 by 599, we get 5 and a remainder of 15.
Put 5 as the next digit of the answer. 
Result so far: 72541.45409015
If we take 2995 away from 3010, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

After the division, we end up with 72541.45409015 and a remainder of 1.5e-08.