78688039 ÷ 518 
The aim is to understand the frequency of 518 in 78688039.

On to step 1:
518 can be fit into 7 0 times, resulting in a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Bring next digit (8) of the dividend behind the 7 and repeat the process: 78 / 518

Advancing to step 2:
78 divided by 518 is 0 with a remainder of 78.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 78 leaves us with 78.
Fetch the next digit (6) from the dividend, attach it to 78 and continue: 786 / 518

Moving on to step 3:
If we divide 786 by 518, we get 1 and a remainder of 268.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we subtract 518 from 786, we get 268.
Fetch the next digit (8) from the dividend, attach it to 268 and continue: 2688 / 518

Advancing to step 4:
518 goes into 2688 5 times with a remainder of 98.
The number 5 becomes the next digit in our result. 
Result so far: 15.0
Deduct 2590 from 2688 and we're left with 98.
Include the next digit (8) from the dividend after 98, then repeat: 988 / 518

Moving on to step 5:
518 goes into 988 1 times with a remainder of 470.
Use 1 as the next digit of our solution. 
Result so far: 151.0
Subtracting 518 from 988 leaves us with 470.
Include the next digit (0) from the dividend after 470, then repeat: 4700 / 518

Going ahead to step 6:
If we divide 4700 by 518, we get 9 and a remainder of 38.
Put 9 as the next digit of the answer. 
Result so far: 1519.0
Subtract 4662 from 4700 to get 38.
Append the next digit (3) from the dividend to 38 and continue with: 383 / 518

Moving on to step 7:
518 can be fit into 383 0 times, resulting in a remainder of 383.
Write down 0 as next digit of the result. 
Result so far: 15190.0
If we subtract 0 from 383, we get 383.
Grab the next digit (9) from the dividend, add it to 383, then carry on: 3839 / 518

Moving on to step 8:
When dividing 3839 by 518, we get 7 with a remainder of 213.
Use 7 as the next digit of our solution. 
Result so far: 151907.0
Subtracting 3626 from 3839 leaves us with 213.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2130, and continue the process.

Going ahead to step 9:
If we divide 2130 by 518, we get 4 and a remainder of 58.
Put 4 as the next digit of the answer. 
Result so far: 151907.4
Subtracting 2072 from 2130 leaves us with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

On to step 10:
580 divided by 518 is 1 with a remainder of 62.
The next digit of our result is 1. 
Result so far: 151907.41
The remainder is 62 after subtracting 518 from 580.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Step 11:
If we divide 620 by 518, we get 1 and a remainder of 102.
The next digit of our result is 1. 
Result so far: 151907.411
Subtracting 518 from 620 leaves us with 102.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1020, and continue the process.

After the division, we end up with 151907.411 and a remainder of 0.0102.