We look at the division of 586570 by 85 
The aim is to understand the frequency of 85 in 586570.

Going ahead to step 1:
If we divide 5 by 85, we get 0 and a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Include the next digit (8) from the dividend after 5, then repeat: 58 / 85

Advancing to step 2:
58 divided by 85 is 0 with a remainder of 58.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 58 leaves us with 58.
Include the next digit (6) from the dividend after 58, then repeat: 586 / 85

Advancing to step 3:
586 divided by 85 is 6 with a remainder of 76.
Use 6 as the next digit of our solution. 
Result so far: 6.0
Subtract 510 from 586 to get 76.
Grab the next digit (5) from the dividend, add it to 76, then carry on: 765 / 85

On to step 4:
If we divide 765 by 85, we get 9 and a remainder of 0.
The next digit of our result is 9. 
Result so far: 69.0
The remainder is 0 after subtracting 765 from 765.
Bring next digit (7) of the dividend behind the 0 and repeat the process: 7 / 85

Moving on to step 5:
If we divide 7 by 85, we get 0 and a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 690.0
If we subtract 0 from 7, we get 7.
Include the next digit (0) from the dividend after 7, then repeat: 70 / 85

Advancing to step 6:
The number 85 fits into 70 0 times, leaving a remainder of 70.
Put 0 as the next digit of the answer. 
Result so far: 6900.0
If we take 0 away from 70, we end up 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 7:
85 goes into 700 8 times with a remainder of 20.
The number 8 becomes the next digit in our result. 
Result so far: 6900.8
Subtracting 680 from 700 leaves us 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.

On to step 8:
85 goes into 200 2 times with a remainder of 30.
The next digit of our result is 2. 
Result so far: 6900.82
If we subtract 170 from 200, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 9:
85 can be fit into 300 3 times, resulting in a remainder of 45.
Put 3 as the next digit of the answer. 
Result so far: 6900.823
Subtract 255 from 300 to get 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Let's proceed to step 10:
85 goes into 450 5 times with a remainder of 25.
Put 5 as the next digit of the answer. 
Result so far: 6900.8235
If we take 425 away from 450, we end up with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

On to step 11:
85 can be fit into 250 2 times, resulting in a remainder of 80.
Put 2 as the next digit of the answer. 
Result so far: 6900.82352
The remainder is 80 after subtracting 170 from 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Going ahead to step 12:
If we divide 800 by 85, we get 9 and a remainder of 35.
Record the quotient 9 as the next digit in the result. 
Result so far: 6900.823529
Subtracting 765 from 800 leaves us with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

On to step 13:
The number 85 fits into 350 4 times, leaving a remainder of 10.
Put 4 as the next digit of the answer. 
Result so far: 6900.8235294
Subtracting 340 from 350 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.

Let's proceed to step 14:
85 can be fit into 100 1 times, resulting in a remainder of 15.
Use 1 as the next digit of our solution. 
Result so far: 6900.82352941
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.

Our division results in 6900.82352941 with a remaining 1.5e-08.