721671 divided by 85 
The aim is to understand the frequency of 85 in 721671.

On to step 1:
85 can be fit into 7 0 times, resulting in a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Take the next digit (2) from the dividend and append it to 7, then repeat: 72 / 85

Advancing to step 2:
The number 85 fits into 72 0 times, leaving a remainder of 72.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 72, we get 72.
Append the next digit (1) from the dividend to 72 and continue with: 721 / 85

On to step 3:
The number 85 fits into 721 8 times, leaving a remainder of 41.
Put 8 as the next digit of the answer. 
Result so far: 8.0
If we subtract 680 from 721, we get 41.
Fetch the next digit (6) from the dividend, attach it to 41 and continue: 416 / 85

Moving on to step 4:
416 divided by 85 is 4 with a remainder of 76.
The number 4 becomes the next digit in our result. 
Result so far: 84.0
Subtracting 340 from 416 leaves us with 76.
Take the next digit (7) from the dividend and append it to 76, then repeat: 767 / 85

Going ahead to step 5:
767 divided by 85 is 9 with a remainder of 2.
Put 9 as the next digit of the answer. 
Result so far: 849.0
Deduct 765 from 767 and we're left with 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 85

Advancing to step 6:
If we divide 21 by 85, we get 0 and a remainder of 21.
The number 0 becomes the next digit in our result. 
Result so far: 8490.0
If we take 0 away from 21, we end up with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Going ahead to step 7:
85 goes into 210 2 times with a remainder of 40.
Write down 2 as next digit of the result. 
Result so far: 8490.2
Subtracting 170 from 210 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.

Let's proceed to step 8:
When dividing 400 by 85, we get 4 with a remainder of 60.
The number 4 becomes the next digit in our result. 
Result so far: 8490.24
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.

Moving on to step 9:
85 can be fit into 600 7 times, resulting in a remainder of 5.
Write down 7 as next digit of the result. 
Result so far: 8490.247
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.

Step 10:
85 goes into 50 0 times with a remainder of 50.
Put 0 as the next digit of the answer. 
Result so far: 8490.247
If we subtract 0 from 50, we 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.

Advancing to step 11:
If we divide 500 by 85, we get 5 and a remainder of 75.
Write down 5 as next digit of the result. 
Result so far: 8490.24705
Subtract 425 from 500 to 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.

Step 12:
The number 85 fits into 750 8 times, leaving a remainder of 70.
Put 8 as the next digit of the answer. 
Result so far: 8490.247058
If we take 680 away from 750, 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.

Step 13:
If we divide 700 by 85, we get 8 and a remainder of 20.
The next digit of our result is 8. 
Result so far: 8490.2470588
If we subtract 680 from 700, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

The quotient of the division is 8490.2470588, and the remainder is 2e-07.