87653849 divided by 815 
The aim is to understand the frequency of 815 in 87653849.

Step 1:
When dividing 8 by 815, we get 0 with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Take the next digit (7) from the dividend and append it to 8, then repeat: 87 / 815

On to step 2:
The number 815 fits into 87 0 times, leaving a remainder of 87.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 87 to get 87.
Fetch the next digit (6) from the dividend, attach it to 87 and continue: 876 / 815

Step 3:
The number 815 fits into 876 1 times, leaving a remainder of 61.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we subtract 815 from 876, we get 61.
Take the next digit (5) from the dividend and append it to 61, then repeat: 615 / 815

Step 4:
When dividing 615 by 815, we get 0 with a remainder of 615.
The number 0 becomes the next digit in our result. 
Result so far: 10.0
If we take 0 away from 615, we end up with 615.
Take the next digit (3) from the dividend and append it to 615, then repeat: 6153 / 815

On to step 5:
815 goes into 6153 7 times with a remainder of 448.
Record the quotient 7 as the next digit in the result. 
Result so far: 107.0
The remainder is 448 after subtracting 5705 from 6153.
Grab the next digit (8) from the dividend, add it to 448, then carry on: 4488 / 815

Step 6:
815 can be fit into 4488 5 times, resulting in a remainder of 413.
The number 5 becomes the next digit in our result. 
Result so far: 1075.0
If we subtract 4075 from 4488, we get 413.
Bring next digit (4) of the dividend behind the 413 and repeat the process: 4134 / 815

Step 7:
If we divide 4134 by 815, we get 5 and a remainder of 59.
Write down 5 as next digit of the result. 
Result so far: 10755.0
Subtracting 4075 from 4134 leaves us with 59.
Grab the next digit (9) from the dividend, add it to 59, then carry on: 599 / 815

Let's proceed to step 8:
815 can be fit into 599 0 times, resulting in a remainder of 599.
Use 0 as the next digit of our solution. 
Result so far: 107550.0
If we take 0 away from 599, we end up with 599.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5990, and continue the process.

Advancing to step 9:
5990 divided by 815 is 7 with a remainder of 285.
The number 7 becomes the next digit in our result. 
Result so far: 107550.7
The remainder is 285 after subtracting 5705 from 5990.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2850, and continue the process.

Going ahead to step 10:
2850 divided by 815 is 3 with a remainder of 405.
Record the quotient 3 as the next digit in the result. 
Result so far: 107550.73
Subtract 2445 from 2850 to get 405.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4050, and continue the process.

Let's proceed to step 11:
If we divide 4050 by 815, we get 4 and a remainder of 790.
Use 4 as the next digit of our solution. 
Result so far: 107550.734
Subtract 3260 from 4050 to get 790.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7900, and continue the process.

Moving on to step 12:
815 can be fit into 7900 9 times, resulting in a remainder of 565.
Use 9 as the next digit of our solution. 
Result so far: 107550.7349
The remainder is 565 after subtracting 7335 from 7900.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5650, and continue the process.

On to step 13:
When dividing 5650 by 815, we get 6 with a remainder of 760.
Write down 6 as next digit of the result. 
Result so far: 107550.73496
If we subtract 4890 from 5650, we get 760.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7600, and continue the process.

Moving on to step 14:
815 goes into 7600 9 times with a remainder of 265.
The next digit of our result is 9. 
Result so far: 107550.734969
The remainder is 265 after subtracting 7335 from 7600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2650, and continue the process.

Going ahead to step 15:
815 goes into 2650 3 times with a remainder of 205.
The next digit of our result is 3. 
Result so far: 107550.7349693
Deduct 2445 from 2650 and we're left with 205.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2050, and continue the process.

Going ahead to step 16:
When dividing 2050 by 815, we get 2 with a remainder of 420.
Record the quotient 2 as the next digit in the result. 
Result so far: 107550.73496932
If we take 1630 away from 2050, we end up with 420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4200, and continue the process.

The final result is 107550.73496932 with a remainder of 4.2e-07.