6423 divided by 85 
The aim is to understand the frequency of 85 in 6423.

Step 1:
If we divide 6 by 85, we get 0 and a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Grab the next digit (4) from the dividend, add it to 6, then carry on: 64 / 85

Going ahead to step 2:
85 goes into 64 0 times with a remainder of 64.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 64 after subtracting 0 from 64.
Take the next digit (2) from the dividend and append it to 64, then repeat: 642 / 85

On to step 3:
When dividing 642 by 85, we get 7 with a remainder of 47.
The number 7 becomes the next digit in our result. 
Result so far: 7.0
Deduct 595 from 642 and we're left with 47.
Append the next digit (3) from the dividend to 47 and continue with: 473 / 85

Moving on to step 4:
473 divided by 85 is 5 with a remainder of 48.
The number 5 becomes the next digit in our result. 
Result so far: 75.0
Subtracting 425 from 473 leaves us with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Going ahead to step 5:
The number 85 fits into 480 5 times, leaving a remainder of 55.
The number 5 becomes the next digit in our result. 
Result so far: 75.5
Subtracting 425 from 480 leaves us with 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Advancing to step 6:
85 goes into 550 6 times with a remainder of 40.
The number 6 becomes the next digit in our result. 
Result so far: 75.56
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.

Moving on to step 7:
400 divided by 85 is 4 with a remainder of 60.
Record the quotient 4 as the next digit in the result. 
Result so far: 75.564
If we take 340 away from 400, 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 8:
85 goes into 600 7 times with a remainder of 5.
The number 7 becomes the next digit in our result. 
Result so far: 75.5647
Deduct 595 from 600 and we're left 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 9:
85 goes into 50 0 times with a remainder of 50.
The next digit of our result is 0. 
Result so far: 75.5647
Subtract 0 from 50 to get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Going ahead to step 10:
85 can be fit into 500 5 times, resulting in a remainder of 75.
The next digit of our result is 5. 
Result so far: 75.564705
If we take 425 away from 500, we end up with 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Let's proceed to step 11:
85 can be fit into 750 8 times, resulting in a remainder of 70.
Put 8 as the next digit of the answer. 
Result so far: 75.5647058
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 12:
85 can be fit into 700 8 times, resulting in a remainder of 20.
The next digit of our result is 8. 
Result so far: 75.56470588
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.

The final result is 75.56470588 with a remainder of 2e-08.