We look at the division of 81640914 by 871 
The aim is to understand the frequency of 871 in 81640914.

Advancing to step 1:
When dividing 8 by 871, we get 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Bring next digit (1) of the dividend behind the 8 and repeat the process: 81 / 871

Step 2:
871 can be fit into 81 0 times, resulting in a remainder of 81.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 81, we get 81.
Fetch the next digit (6) from the dividend, attach it to 81 and continue: 816 / 871

On to step 3:
The number 871 fits into 816 0 times, leaving a remainder of 816.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 816, we get 816.
Grab the next digit (4) from the dividend, add it to 816, then carry on: 8164 / 871

Going ahead to step 4:
When dividing 8164 by 871, we get 9 with a remainder of 325.
The next digit of our result is 9. 
Result so far: 9.0
Deduct 7839 from 8164 and we're left with 325.
Fetch the next digit (0) from the dividend, attach it to 325 and continue: 3250 / 871

Advancing to step 5:
The number 871 fits into 3250 3 times, leaving a remainder of 637.
The number 3 becomes the next digit in our result. 
Result so far: 93.0
Subtracting 2613 from 3250 leaves us with 637.
Take the next digit (9) from the dividend and append it to 637, then repeat: 6379 / 871

Going ahead to step 6:
If we divide 6379 by 871, we get 7 and a remainder of 282.
The next digit of our result is 7. 
Result so far: 937.0
Deduct 6097 from 6379 and we're left with 282.
Bring next digit (1) of the dividend behind the 282 and repeat the process: 2821 / 871

On to step 7:
871 can be fit into 2821 3 times, resulting in a remainder of 208.
Put 3 as the next digit of the answer. 
Result so far: 9373.0
Subtract 2613 from 2821 to get 208.
Include the next digit (4) from the dividend after 208, then repeat: 2084 / 871

Moving on to step 8:
When dividing 2084 by 871, we get 2 with a remainder of 342.
Record the quotient 2 as the next digit in the result. 
Result so far: 93732.0
Subtracting 1742 from 2084 leaves us with 342.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3420, and continue the process.

Let's proceed to step 9:
When dividing 3420 by 871, we get 3 with a remainder of 807.
Record the quotient 3 as the next digit in the result. 
Result so far: 93732.3
If we subtract 2613 from 3420, we get 807.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8070, and continue the process.

Step 10:
When dividing 8070 by 871, we get 9 with a remainder of 231.
Use 9 as the next digit of our solution. 
Result so far: 93732.39
If we take 7839 away from 8070, we end up with 231.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2310, and continue the process.

Let's proceed to step 11:
The number 871 fits into 2310 2 times, leaving a remainder of 568.
The next digit of our result is 2. 
Result so far: 93732.392
Subtracting 1742 from 2310 leaves us with 568.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5680, and continue the process.

Step 12:
871 can be fit into 5680 6 times, resulting in a remainder of 454.
Record the quotient 6 as the next digit in the result. 
Result so far: 93732.3926
If we take 5226 away from 5680, we end up with 454.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4540, and continue the process.

Going ahead to step 13:
When dividing 4540 by 871, we get 5 with a remainder of 185.
The next digit of our result is 5. 
Result so far: 93732.39265
If we take 4355 away from 4540, we end up with 185.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1850, and continue the process.

Going ahead to step 14:
871 goes into 1850 2 times with a remainder of 108.
Write down 2 as next digit of the result. 
Result so far: 93732.392652
Subtract 1742 from 1850 to get 108.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1080, and continue the process.

Going ahead to step 15:
If we divide 1080 by 871, we get 1 and a remainder of 209.
Put 1 as the next digit of the answer. 
Result so far: 93732.3926521
The remainder is 209 after subtracting 871 from 1080.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2090, and continue the process.

Advancing to step 16:
If we divide 2090 by 871, we get 2 and a remainder of 348.
Write down 2 as next digit of the result. 
Result so far: 93732.39265212
If we take 1742 away from 2090, we end up with 348.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3480, and continue the process.

The final outcome is 93732.39265212, with a leftover of 3.48e-07.