We look at the division of 81055251 by 519 
The aim is to understand the frequency of 519 in 81055251.

Step 1:
When dividing 8 by 519, we get 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Include the next digit (1) from the dividend after 8, then repeat: 81 / 519

Moving on to step 2:
The number 519 fits into 81 0 times, leaving a remainder of 81.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 81 leaves us with 81.
Include the next digit (0) from the dividend after 81, then repeat: 810 / 519

On to step 3:
The number 519 fits into 810 1 times, leaving a remainder of 291.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we subtract 519 from 810, we get 291.
Append the next digit (5) from the dividend to 291 and continue with: 2915 / 519

On to step 4:
The number 519 fits into 2915 5 times, leaving a remainder of 320.
The next digit of our result is 5. 
Result so far: 15.0
Subtract 2595 from 2915 to get 320.
Take the next digit (5) from the dividend and append it to 320, then repeat: 3205 / 519

Moving on to step 5:
If we divide 3205 by 519, we get 6 and a remainder of 91.
Record the quotient 6 as the next digit in the result. 
Result so far: 156.0
The remainder is 91 after subtracting 3114 from 3205.
Bring next digit (2) of the dividend behind the 91 and repeat the process: 912 / 519

Moving on to step 6:
The number 519 fits into 912 1 times, leaving a remainder of 393.
Record the quotient 1 as the next digit in the result. 
Result so far: 1561.0
If we subtract 519 from 912, we get 393.
Append the next digit (5) from the dividend to 393 and continue with: 3935 / 519

Advancing to step 7:
519 goes into 3935 7 times with a remainder of 302.
Put 7 as the next digit of the answer. 
Result so far: 15617.0
Subtract 3633 from 3935 to get 302.
Bring next digit (1) of the dividend behind the 302 and repeat the process: 3021 / 519

Going ahead to step 8:
If we divide 3021 by 519, we get 5 and a remainder of 426.
Use 5 as the next digit of our solution. 
Result so far: 156175.0
Subtract 2595 from 3021 to get 426.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4260, and continue the process.

Step 9:
519 can be fit into 4260 8 times, resulting in a remainder of 108.
The number 8 becomes the next digit in our result. 
Result so far: 156175.8
Subtract 4152 from 4260 to get 108.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1080, and continue the process.

Step 10:
519 goes into 1080 2 times with a remainder of 42.
Use 2 as the next digit of our solution. 
Result so far: 156175.82
If we take 1038 away from 1080, we end up with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Advancing to step 11:
When dividing 420 by 519, we get 0 with a remainder of 420.
The next digit of our result is 0. 
Result so far: 156175.82
Deduct 0 from 420 and we're left with 420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4200, and continue the process.

Moving on to step 12:
4200 divided by 519 is 8 with a remainder of 48.
Write down 8 as next digit of the result. 
Result so far: 156175.8208
Subtracting 4152 from 4200 leaves us with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

On to step 13:
519 goes into 480 0 times with a remainder of 480.
Write down 0 as next digit of the result. 
Result so far: 156175.8208
If we subtract 0 from 480, we get 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4800, and continue the process.

Let's proceed to step 14:
When dividing 4800 by 519, we get 9 with a remainder of 129.
The number 9 becomes the next digit in our result. 
Result so far: 156175.820809
If we subtract 4671 from 4800, we get 129.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1290, and continue the process.

Going ahead to step 15:
The number 519 fits into 1290 2 times, leaving a remainder of 252.
The number 2 becomes the next digit in our result. 
Result so far: 156175.8208092
Subtracting 1038 from 1290 leaves us with 252.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2520, and continue the process.

Let's proceed to step 16:
519 can be fit into 2520 4 times, resulting in a remainder of 444.
Use 4 as the next digit of our solution. 
Result so far: 156175.82080924
Deduct 2076 from 2520 and we're left with 444.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4440, and continue the process.

The final outcome is 156175.82080924, with a leftover of 4.44e-07.