We look at the division of 644105 by 85 
The aim is to understand the frequency of 85 in 644105.

On to step 1:
When dividing 6 by 85, we get 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Take the next digit (4) from the dividend and append it to 6, then repeat: 64 / 85

Going ahead to step 2:
If we divide 64 by 85, we get 0 and a remainder of 64.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 64 to get 64.
Take the next digit (4) from the dividend and append it to 64, then repeat: 644 / 85

Going ahead to step 3:
If we divide 644 by 85, we get 7 and a remainder of 49.
Record the quotient 7 as the next digit in the result. 
Result so far: 7.0
If we subtract 595 from 644, we get 49.
Fetch the next digit (1) from the dividend, attach it to 49 and continue: 491 / 85

Step 4:
85 can be fit into 491 5 times, resulting in a remainder of 66.
Record the quotient 5 as the next digit in the result. 
Result so far: 75.0
If we take 425 away from 491, we end up with 66.
Append the next digit (0) from the dividend to 66 and continue with: 660 / 85

On to step 5:
When dividing 660 by 85, we get 7 with a remainder of 65.
The number 7 becomes the next digit in our result. 
Result so far: 757.0
If we take 595 away from 660, we end up with 65.
Include the next digit (5) from the dividend after 65, then repeat: 655 / 85

On to step 6:
655 divided by 85 is 7 with a remainder of 60.
Write down 7 as next digit of the result. 
Result so far: 7577.0
If we take 595 away from 655, we end up 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.

Step 7:
If we divide 600 by 85, we get 7 and a remainder of 5.
The number 7 becomes the next digit in our result. 
Result so far: 7577.7
If we subtract 595 from 600, we get 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 8:
85 can be fit into 50 0 times, resulting in a remainder of 50.
Write down 0 as next digit of the result. 
Result so far: 7577.7
Subtracting 0 from 50 leaves us 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.

Let's proceed to step 9:
85 goes into 500 5 times with a remainder of 75.
Use 5 as the next digit of our solution. 
Result so far: 7577.705
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 10:
750 divided by 85 is 8 with a remainder of 70.
The number 8 becomes the next digit in our result. 
Result so far: 7577.7058
Subtracting 680 from 750 leaves us 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.

Let's proceed to step 11:
700 divided by 85 is 8 with a remainder of 20.
The number 8 becomes the next digit in our result. 
Result so far: 7577.70588
The remainder is 20 after subtracting 680 from 700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

In conclusion, the division gives 7577.70588 with a balance of 2e-05.