We look at the division of 78880758 by 515 
The aim is to understand the frequency of 515 in 78880758.

On to step 1:
515 goes into 7 0 times with a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Grab the next digit (8) from the dividend, add it to 7, then carry on: 78 / 515

On to step 2:
515 can be fit into 78 0 times, resulting in a remainder of 78.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 78 and we're left with 78.
Grab the next digit (8) from the dividend, add it to 78, then carry on: 788 / 515

Let's proceed to step 3:
When dividing 788 by 515, we get 1 with a remainder of 273.
Write down 1 as next digit of the result. 
Result so far: 1.0
The remainder is 273 after subtracting 515 from 788.
Include the next digit (8) from the dividend after 273, then repeat: 2738 / 515

Going ahead to step 4:
2738 divided by 515 is 5 with a remainder of 163.
Use 5 as the next digit of our solution. 
Result so far: 15.0
If we take 2575 away from 2738, we end up with 163.
Append the next digit (0) from the dividend to 163 and continue with: 1630 / 515

Advancing to step 5:
When dividing 1630 by 515, we get 3 with a remainder of 85.
The next digit of our result is 3. 
Result so far: 153.0
Subtract 1545 from 1630 to get 85.
Bring next digit (7) of the dividend behind the 85 and repeat the process: 857 / 515

Advancing to step 6:
515 goes into 857 1 times with a remainder of 342.
Write down 1 as next digit of the result. 
Result so far: 1531.0
Subtract 515 from 857 to get 342.
Fetch the next digit (5) from the dividend, attach it to 342 and continue: 3425 / 515

Step 7:
515 goes into 3425 6 times with a remainder of 335.
Put 6 as the next digit of the answer. 
Result so far: 15316.0
The remainder is 335 after subtracting 3090 from 3425.
Grab the next digit (8) from the dividend, add it to 335, then carry on: 3358 / 515

Going ahead to step 8:
When dividing 3358 by 515, we get 6 with a remainder of 268.
The number 6 becomes the next digit in our result. 
Result so far: 153166.0
The remainder is 268 after subtracting 3090 from 3358.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2680, and continue the process.

Step 9:
If we divide 2680 by 515, we get 5 and a remainder of 105.
Write down 5 as next digit of the result. 
Result so far: 153166.5
Subtracting 2575 from 2680 leaves us with 105.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1050, and continue the process.

On to step 10:
515 goes into 1050 2 times with a remainder of 20.
Use 2 as the next digit of our solution. 
Result so far: 153166.52
Subtract 1030 from 1050 to get 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 11:
If we divide 200 by 515, we get 0 and a remainder of 200.
The number 0 becomes the next digit in our result. 
Result so far: 153166.52
If we take 0 away from 200, we end up with 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Step 12:
The number 515 fits into 2000 3 times, leaving a remainder of 455.
The next digit of our result is 3. 
Result so far: 153166.5203
If we subtract 1545 from 2000, we get 455.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4550, and continue the process.

Let's proceed to step 13:
The number 515 fits into 4550 8 times, leaving a remainder of 430.
Record the quotient 8 as the next digit in the result. 
Result so far: 153166.52038
Subtracting 4120 from 4550 leaves us with 430.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4300, and continue the process.

Step 14:
When dividing 4300 by 515, we get 8 with a remainder of 180.
Write down 8 as next digit of the result. 
Result so far: 153166.520388
Deduct 4120 from 4300 and we're left with 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

After the division, we end up with 153166.520388 and a remainder of 1.8e-05.