12111511 divided by 519 
The aim is to understand the frequency of 519 in 12111511.

Going ahead to step 1:
519 can be fit into 1 0 times, resulting in a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Take the next digit (2) from the dividend and append it to 1, then repeat: 12 / 519

Moving on to step 2:
12 divided by 519 is 0 with a remainder of 12.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 12 after subtracting 0 from 12.
Include the next digit (1) from the dividend after 12, then repeat: 121 / 519

Let's proceed to step 3:
The number 519 fits into 121 0 times, leaving a remainder of 121.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 121 to get 121.
Take the next digit (1) from the dividend and append it to 121, then repeat: 1211 / 519

Going ahead to step 4:
1211 divided by 519 is 2 with a remainder of 173.
Write down 2 as next digit of the result. 
Result so far: 2.0
Subtract 1038 from 1211 to get 173.
Append the next digit (1) from the dividend to 173 and continue with: 1731 / 519

Going ahead to step 5:
When dividing 1731 by 519, we get 3 with a remainder of 174.
The number 3 becomes the next digit in our result. 
Result so far: 23.0
Deduct 1557 from 1731 and we're left with 174.
Bring next digit (5) of the dividend behind the 174 and repeat the process: 1745 / 519

Advancing to step 6:
The number 519 fits into 1745 3 times, leaving a remainder of 188.
Record the quotient 3 as the next digit in the result. 
Result so far: 233.0
If we subtract 1557 from 1745, we get 188.
Fetch the next digit (1) from the dividend, attach it to 188 and continue: 1881 / 519

Going ahead to step 7:
1881 divided by 519 is 3 with a remainder of 324.
Write down 3 as next digit of the result. 
Result so far: 2333.0
If we subtract 1557 from 1881, we get 324.
Include the next digit (1) from the dividend after 324, then repeat: 3241 / 519

On to step 8:
When dividing 3241 by 519, we get 6 with a remainder of 127.
Use 6 as the next digit of our solution. 
Result so far: 23336.0
Subtracting 3114 from 3241 leaves us with 127.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1270, and continue the process.

Moving on to step 9:
If we divide 1270 by 519, we get 2 and a remainder of 232.
The number 2 becomes the next digit in our result. 
Result so far: 23336.2
Deduct 1038 from 1270 and we're left with 232.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2320, and continue the process.

Step 10:
When dividing 2320 by 519, we get 4 with a remainder of 244.
Put 4 as the next digit of the answer. 
Result so far: 23336.24
The remainder is 244 after subtracting 2076 from 2320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2440, and continue the process.

On to step 11:
519 can be fit into 2440 4 times, resulting in a remainder of 364.
Record the quotient 4 as the next digit in the result. 
Result so far: 23336.244
If we subtract 2076 from 2440, we get 364.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3640, and continue the process.

The final outcome is 23336.244, with a leftover of 0.0364.