509559 divided by 85 
The aim is to understand the frequency of 85 in 509559.

On to step 1:
85 can be fit into 5 0 times, resulting in a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Fetch the next digit (0) from the dividend, attach it to 5 and continue: 50 / 85

Going ahead to step 2:
The number 85 fits into 50 0 times, leaving a remainder of 50.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 50 leaves us with 50.
Include the next digit (9) from the dividend after 50, then repeat: 509 / 85

On to step 3:
When dividing 509 by 85, we get 5 with a remainder of 84.
The next digit of our result is 5. 
Result so far: 5.0
Deduct 425 from 509 and we're left with 84.
Fetch the next digit (5) from the dividend, attach it to 84 and continue: 845 / 85

Let's proceed to step 4:
If we divide 845 by 85, we get 9 and a remainder of 80.
Write down 9 as next digit of the result. 
Result so far: 59.0
Subtracting 765 from 845 leaves us with 80.
Include the next digit (5) from the dividend after 80, then repeat: 805 / 85

On to step 5:
The number 85 fits into 805 9 times, leaving a remainder of 40.
Put 9 as the next digit of the answer. 
Result so far: 599.0
Subtract 765 from 805 to get 40.
Grab the next digit (9) from the dividend, add it to 40, then carry on: 409 / 85

On to step 6:
If we divide 409 by 85, we get 4 and a remainder of 69.
The next digit of our result is 4. 
Result so far: 5994.0
Subtract 340 from 409 to get 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Moving on to step 7:
When dividing 690 by 85, we get 8 with a remainder of 10.
Record the quotient 8 as the next digit in the result. 
Result so far: 5994.8
Subtracting 680 from 690 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 8:
The number 85 fits into 100 1 times, leaving a remainder of 15.
The number 1 becomes the next digit in our result. 
Result so far: 5994.81
The remainder is 15 after subtracting 85 from 100.
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 9:
85 can be fit into 150 1 times, resulting in a remainder of 65.
Put 1 as the next digit of the answer. 
Result so far: 5994.811
Subtracting 85 from 150 leaves us with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Our division results in 5994.811 with a remaining 0.0065.