We're dividing 87339521 by 519 
The aim is to understand the frequency of 519 in 87339521.

Let's proceed to step 1:
If we divide 8 by 519, we get 0 and a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Append the next digit (7) from the dividend to 8 and continue with: 87 / 519

Going ahead to step 2:
87 divided by 519 is 0 with a remainder of 87.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 87, we end up with 87.
Grab the next digit (3) from the dividend, add it to 87, then carry on: 873 / 519

Step 3:
873 divided by 519 is 1 with a remainder of 354.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we subtract 519 from 873, we get 354.
Take the next digit (3) from the dividend and append it to 354, then repeat: 3543 / 519

Moving on to step 4:
3543 divided by 519 is 6 with a remainder of 429.
Put 6 as the next digit of the answer. 
Result so far: 16.0
Subtracting 3114 from 3543 leaves us with 429.
Take the next digit (9) from the dividend and append it to 429, then repeat: 4299 / 519

On to step 5:
The number 519 fits into 4299 8 times, leaving a remainder of 147.
Use 8 as the next digit of our solution. 
Result so far: 168.0
If we subtract 4152 from 4299, we get 147.
Take the next digit (5) from the dividend and append it to 147, then repeat: 1475 / 519

Step 6:
The number 519 fits into 1475 2 times, leaving a remainder of 437.
Record the quotient 2 as the next digit in the result. 
Result so far: 1682.0
The remainder is 437 after subtracting 1038 from 1475.
Include the next digit (2) from the dividend after 437, then repeat: 4372 / 519

Advancing to step 7:
519 goes into 4372 8 times with a remainder of 220.
The number 8 becomes the next digit in our result. 
Result so far: 16828.0
Deduct 4152 from 4372 and we're left with 220.
Append the next digit (1) from the dividend to 220 and continue with: 2201 / 519

Step 8:
2201 divided by 519 is 4 with a remainder of 125.
Write down 4 as next digit of the result. 
Result so far: 168284.0
If we subtract 2076 from 2201, we get 125.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1250, and continue the process.

On to step 9:
If we divide 1250 by 519, we get 2 and a remainder of 212.
Put 2 as the next digit of the answer. 
Result so far: 168284.2
If we take 1038 away from 1250, we end up with 212.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2120, and continue the process.

Step 10:
2120 divided by 519 is 4 with a remainder of 44.
The next digit of our result is 4. 
Result so far: 168284.24
Deduct 2076 from 2120 and we're left with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Advancing to step 11:
519 can be fit into 440 0 times, resulting in a remainder of 440.
Record the quotient 0 as the next digit in the result. 
Result so far: 168284.24
If we subtract 0 from 440, we get 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4400, and continue the process.

On to step 12:
If we divide 4400 by 519, we get 8 and a remainder of 248.
The next digit of our result is 8. 
Result so far: 168284.2408
Subtracting 4152 from 4400 leaves us with 248.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2480, and continue the process.

Advancing to step 13:
519 can be fit into 2480 4 times, resulting in a remainder of 404.
Write down 4 as next digit of the result. 
Result so far: 168284.24084
The remainder is 404 after subtracting 2076 from 2480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4040, and continue the process.

Let's proceed to step 14:
519 can be fit into 4040 7 times, resulting in a remainder of 407.
Write down 7 as next digit of the result. 
Result so far: 168284.240847
Deduct 3633 from 4040 and we're left with 407.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4070, and continue the process.

Advancing to step 15:
4070 divided by 519 is 7 with a remainder of 437.
Put 7 as the next digit of the answer. 
Result so far: 168284.2408477
Subtracting 3633 from 4070 leaves us with 437.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4370, and continue the process.

After the division, we end up with 168284.2408477 and a remainder of 4.37e-06.