We look at the division of 86404256 by 510 
The aim is to understand the frequency of 510 in 86404256.

Step 1:
510 goes into 8 0 times with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Take the next digit (6) from the dividend and append it to 8, then repeat: 86 / 510

Step 2:
When dividing 86 by 510, we get 0 with a remainder of 86.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 86 to get 86.
Fetch the next digit (4) from the dividend, attach it to 86 and continue: 864 / 510

On to step 3:
If we divide 864 by 510, we get 1 and a remainder of 354.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Deduct 510 from 864 and we're left with 354.
Take the next digit (0) from the dividend and append it to 354, then repeat: 3540 / 510

Step 4:
If we divide 3540 by 510, we get 6 and a remainder of 480.
Write down 6 as next digit of the result. 
Result so far: 16.0
Subtracting 3060 from 3540 leaves us with 480.
Bring next digit (4) of the dividend behind the 480 and repeat the process: 4804 / 510

On to step 5:
510 can be fit into 4804 9 times, resulting in a remainder of 214.
Use 9 as the next digit of our solution. 
Result so far: 169.0
Subtract 4590 from 4804 to get 214.
Append the next digit (2) from the dividend to 214 and continue with: 2142 / 510

On to step 6:
When dividing 2142 by 510, we get 4 with a remainder of 102.
The number 4 becomes the next digit in our result. 
Result so far: 1694.0
The remainder is 102 after subtracting 2040 from 2142.
Include the next digit (5) from the dividend after 102, then repeat: 1025 / 510

Let's proceed to step 7:
510 goes into 1025 2 times with a remainder of 5.
The number 2 becomes the next digit in our result. 
Result so far: 16942.0
Deduct 1020 from 1025 and we're left with 5.
Grab the next digit (6) from the dividend, add it to 5, then carry on: 56 / 510

On to step 8:
The number 510 fits into 56 0 times, leaving a remainder of 56.
The next digit of our result is 0. 
Result so far: 169420.0
The remainder is 56 after subtracting 0 from 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

On to step 9:
The number 510 fits into 560 1 times, leaving a remainder of 50.
Record the quotient 1 as the next digit in the result. 
Result so far: 169420.1
The remainder is 50 after subtracting 510 from 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Step 10:
510 can be fit into 500 0 times, resulting in a remainder of 500.
The next digit of our result is 0. 
Result so far: 169420.1
If we subtract 0 from 500, we get 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5000, and continue the process.

Step 11:
The number 510 fits into 5000 9 times, leaving a remainder of 410.
Use 9 as the next digit of our solution. 
Result so far: 169420.109
Subtracting 4590 from 5000 leaves us with 410.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4100, and continue the process.

Advancing to step 12:
4100 divided by 510 is 8 with a remainder of 20.
Write down 8 as next digit of the result. 
Result so far: 169420.1098
Subtracting 4080 from 4100 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 13:
510 can be fit into 200 0 times, resulting in a remainder of 200.
Put 0 as the next digit of the answer. 
Result so far: 169420.1098
The remainder is 200 after subtracting 0 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

On to step 14:
510 goes into 2000 3 times with a remainder of 470.
Put 3 as the next digit of the answer. 
Result so far: 169420.109803
Deduct 1530 from 2000 and we're left with 470.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4700, and continue the process.

Step 15:
510 can be fit into 4700 9 times, resulting in a remainder of 110.
The next digit of our result is 9. 
Result so far: 169420.1098039
Subtract 4590 from 4700 to get 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

Advancing to step 16:
When dividing 1100 by 510, we get 2 with a remainder of 80.
The number 2 becomes the next digit in our result. 
Result so far: 169420.10980392
Deduct 1020 from 1100 and we're left with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

After the division, we end up with 169420.10980392 and a remainder of 8e-08.