We look at the division of 8702132 by 815 
The aim is to understand the frequency of 815 in 8702132.

Moving on to step 1:
The number 815 fits into 8 0 times, leaving a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Include the next digit (7) from the dividend after 8, then repeat: 87 / 815

Let's proceed to step 2:
815 can be fit into 87 0 times, resulting in a remainder of 87.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 87 leaves us with 87.
Take the next digit (0) from the dividend and append it to 87, then repeat: 870 / 815

Going ahead to step 3:
The number 815 fits into 870 1 times, leaving a remainder of 55.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtracting 815 from 870 leaves us with 55.
Include the next digit (2) from the dividend after 55, then repeat: 552 / 815

Moving on to step 4:
The number 815 fits into 552 0 times, leaving a remainder of 552.
Use 0 as the next digit of our solution. 
Result so far: 10.0
The remainder is 552 after subtracting 0 from 552.
Grab the next digit (1) from the dividend, add it to 552, then carry on: 5521 / 815

Let's proceed to step 5:
815 can be fit into 5521 6 times, resulting in a remainder of 631.
The number 6 becomes the next digit in our result. 
Result so far: 106.0
Subtract 4890 from 5521 to get 631.
Grab the next digit (3) from the dividend, add it to 631, then carry on: 6313 / 815

On to step 6:
If we divide 6313 by 815, we get 7 and a remainder of 608.
The number 7 becomes the next digit in our result. 
Result so far: 1067.0
Deduct 5705 from 6313 and we're left with 608.
Append the next digit (2) from the dividend to 608 and continue with: 6082 / 815

On to step 7:
If we divide 6082 by 815, we get 7 and a remainder of 377.
Record the quotient 7 as the next digit in the result. 
Result so far: 10677.0
The remainder is 377 after subtracting 5705 from 6082.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3770, and continue the process.

Advancing to step 8:
815 goes into 3770 4 times with a remainder of 510.
Use 4 as the next digit of our solution. 
Result so far: 10677.4
The remainder is 510 after subtracting 3260 from 3770.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5100, and continue the process.

Moving on to step 9:
The number 815 fits into 5100 6 times, leaving a remainder of 210.
The next digit of our result is 6. 
Result so far: 10677.46
Deduct 4890 from 5100 and we're left with 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2100, and continue the process.

Step 10:
When dividing 2100 by 815, we get 2 with a remainder of 470.
The number 2 becomes the next digit in our result. 
Result so far: 10677.462
If we subtract 1630 from 2100, we get 470.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4700, and continue the process.

Moving on to step 11:
When dividing 4700 by 815, we get 5 with a remainder of 625.
Put 5 as the next digit of the answer. 
Result so far: 10677.4625
Subtracting 4075 from 4700 leaves us with 625.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6250, and continue the process.

Step 12:
815 goes into 6250 7 times with a remainder of 545.
Record the quotient 7 as the next digit in the result. 
Result so far: 10677.46257
The remainder is 545 after subtracting 5705 from 6250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5450, and continue the process.

Step 13:
If we divide 5450 by 815, we get 6 and a remainder of 560.
Use 6 as the next digit of our solution. 
Result so far: 10677.462576
If we take 4890 away from 5450, we end up with 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5600, and continue the process.

Step 14:
When dividing 5600 by 815, we get 6 with a remainder of 710.
The number 6 becomes the next digit in our result. 
Result so far: 10677.4625766
Subtracting 4890 from 5600 leaves us with 710.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7100, and continue the process.

Our division results in 10677.4625766 with a remaining 7.1e-06.