We look at the division of 871798 by 85 
The aim is to understand the frequency of 85 in 871798.

Going ahead to step 1:
If we divide 8 by 85, we get 0 and a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Take the next digit (7) from the dividend and append it to 8, then repeat: 87 / 85

Moving on to step 2:
85 can be fit into 87 1 times, resulting in a remainder of 2.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we subtract 85 from 87, we get 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 85

On to step 3:
When dividing 21 by 85, we get 0 with a remainder of 21.
Put 0 as the next digit of the answer. 
Result so far: 10.0
Deduct 0 from 21 and we're left with 21.
Fetch the next digit (7) from the dividend, attach it to 21 and continue: 217 / 85

Advancing to step 4:
85 can be fit into 217 2 times, resulting in a remainder of 47.
Record the quotient 2 as the next digit in the result. 
Result so far: 102.0
Subtract 170 from 217 to get 47.
Fetch the next digit (9) from the dividend, attach it to 47 and continue: 479 / 85

Let's proceed to step 5:
The number 85 fits into 479 5 times, leaving a remainder of 54.
Put 5 as the next digit of the answer. 
Result so far: 1025.0
If we subtract 425 from 479, we get 54.
Append the next digit (8) from the dividend to 54 and continue with: 548 / 85

Step 6:
The number 85 fits into 548 6 times, leaving a remainder of 38.
Record the quotient 6 as the next digit in the result. 
Result so far: 10256.0
If we take 510 away from 548, we end up with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Let's proceed to step 7:
85 can be fit into 380 4 times, resulting in a remainder of 40.
The number 4 becomes the next digit in our result. 
Result so far: 10256.4
The remainder is 40 after subtracting 340 from 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Advancing to step 8:
400 divided by 85 is 4 with a remainder of 60.
The next digit of our result is 4. 
Result so far: 10256.44
The remainder is 60 after subtracting 340 from 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

The final outcome is 10256.44, with a leftover of 0.06.