We look at the division of 669576 by 85 
The aim is to understand the frequency of 85 in 669576.

On to step 1:
If we divide 6 by 85, we get 0 and a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Include the next digit (6) from the dividend after 6, then repeat: 66 / 85

Let's proceed to step 2:
85 goes into 66 0 times with a remainder of 66.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 66, we get 66.
Bring next digit (9) of the dividend behind the 66 and repeat the process: 669 / 85

Going ahead to step 3:
85 can be fit into 669 7 times, resulting in a remainder of 74.
Use 7 as the next digit of our solution. 
Result so far: 7.0
Subtracting 595 from 669 leaves us with 74.
Grab the next digit (5) from the dividend, add it to 74, then carry on: 745 / 85

On to step 4:
85 goes into 745 8 times with a remainder of 65.
Use 8 as the next digit of our solution. 
Result so far: 78.0
If we subtract 680 from 745, we get 65.
Include the next digit (7) from the dividend after 65, then repeat: 657 / 85

Moving on to step 5:
657 divided by 85 is 7 with a remainder of 62.
The next digit of our result is 7. 
Result so far: 787.0
If we subtract 595 from 657, we get 62.
Grab the next digit (6) from the dividend, add it to 62, then carry on: 626 / 85

Let's proceed to step 6:
When dividing 626 by 85, we get 7 with a remainder of 31.
The next digit of our result is 7. 
Result so far: 7877.0
Subtracting 595 from 626 leaves us with 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

On to step 7:
If we divide 310 by 85, we get 3 and a remainder of 55.
Record the quotient 3 as the next digit in the result. 
Result so far: 7877.3
The remainder is 55 after subtracting 255 from 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Moving on to step 8:
If we divide 550 by 85, we get 6 and a remainder of 40.
The next digit of our result is 6. 
Result so far: 7877.36
Subtracting 510 from 550 leaves us with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

On to step 9:
If we divide 400 by 85, we get 4 and a remainder of 60.
Record the quotient 4 as the next digit in the result. 
Result so far: 7877.364
Subtracting 340 from 400 leaves us with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Going ahead to step 10:
85 can be fit into 600 7 times, resulting in a remainder of 5.
The next digit of our result is 7. 
Result so far: 7877.3647
Subtracting 595 from 600 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

On to step 11:
When dividing 50 by 85, we get 0 with a remainder of 50.
Record the quotient 0 as the next digit in the result. 
Result so far: 7877.3647
If we take 0 away from 50, we end up with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

On to step 12:
85 goes into 500 5 times with a remainder of 75.
The next digit of our result is 5. 
Result so far: 7877.364705
If we subtract 425 from 500, we get 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

On to step 13:
When dividing 750 by 85, we get 8 with a remainder of 70.
Use 8 as the next digit of our solution. 
Result so far: 7877.3647058
Deduct 680 from 750 and we're left with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

On to step 14:
85 can be fit into 700 8 times, resulting in a remainder of 20.
Put 8 as the next digit of the answer. 
Result so far: 7877.36470588
If we take 680 away from 700, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Our division results in 7877.36470588 with a remaining 2e-08.