We look at the division of 671784 by 85 
The aim is to understand the frequency of 85 in 671784.

Step 1:
6 divided by 85 is 0 with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Bring next digit (7) of the dividend behind the 6 and repeat the process: 67 / 85

Going ahead to step 2:
85 can be fit into 67 0 times, resulting in a remainder of 67.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 67 and we're left with 67.
Take the next digit (1) from the dividend and append it to 67, then repeat: 671 / 85

Moving on to step 3:
85 goes into 671 7 times with a remainder of 76.
Use 7 as the next digit of our solution. 
Result so far: 7.0
The remainder is 76 after subtracting 595 from 671.
Append the next digit (7) from the dividend to 76 and continue with: 767 / 85

Let's proceed to step 4:
When dividing 767 by 85, we get 9 with a remainder of 2.
The number 9 becomes the next digit in our result. 
Result so far: 79.0
Deduct 765 from 767 and we're left with 2.
Grab the next digit (8) from the dividend, add it to 2, then carry on: 28 / 85

Step 5:
28 divided by 85 is 0 with a remainder of 28.
Record the quotient 0 as the next digit in the result. 
Result so far: 790.0
The remainder is 28 after subtracting 0 from 28.
Fetch the next digit (4) from the dividend, attach it to 28 and continue: 284 / 85

Moving on to step 6:
85 can be fit into 284 3 times, resulting in a remainder of 29.
Put 3 as the next digit of the answer. 
Result so far: 7903.0
Subtracting 255 from 284 leaves us with 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Let's proceed to step 7:
If we divide 290 by 85, we get 3 and a remainder of 35.
Record the quotient 3 as the next digit in the result. 
Result so far: 7903.3
The remainder is 35 after subtracting 255 from 290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Going ahead to step 8:
When dividing 350 by 85, we get 4 with a remainder of 10.
Use 4 as the next digit of our solution. 
Result so far: 7903.34
The remainder is 10 after subtracting 340 from 350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 9:
When dividing 100 by 85, we get 1 with a remainder of 15.
Use 1 as the next digit of our solution. 
Result so far: 7903.341
If we subtract 85 from 100, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 10:
150 divided by 85 is 1 with a remainder of 65.
Use 1 as the next digit of our solution. 
Result so far: 7903.3411
If we subtract 85 from 150, we get 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

The final outcome is 7903.3411, with a leftover of 0.00065.