778571 ÷ 85 
The aim is to understand the frequency of 85 in 778571.

Step 1:
If we divide 7 by 85, we get 0 and a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Take the next digit (7) from the dividend and append it to 7, then repeat: 77 / 85

Advancing to step 2:
When dividing 77 by 85, we get 0 with a remainder of 77.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 77 to get 77.
Grab the next digit (8) from the dividend, add it to 77, then carry on: 778 / 85

Moving on to step 3:
85 can be fit into 778 9 times, resulting in a remainder of 13.
Put 9 as the next digit of the answer. 
Result so far: 9.0
The remainder is 13 after subtracting 765 from 778.
Bring next digit (5) of the dividend behind the 13 and repeat the process: 135 / 85

Step 4:
When dividing 135 by 85, we get 1 with a remainder of 50.
The number 1 becomes the next digit in our result. 
Result so far: 91.0
The remainder is 50 after subtracting 85 from 135.
Fetch the next digit (7) from the dividend, attach it to 50 and continue: 507 / 85

On to step 5:
If we divide 507 by 85, we get 5 and a remainder of 82.
Put 5 as the next digit of the answer. 
Result so far: 915.0
Deduct 425 from 507 and we're left with 82.
Include the next digit (1) from the dividend after 82, then repeat: 821 / 85

Advancing to step 6:
85 can be fit into 821 9 times, resulting in a remainder of 56.
The next digit of our result is 9. 
Result so far: 9159.0
If we subtract 765 from 821, we get 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Advancing to step 7:
If we divide 560 by 85, we get 6 and a remainder of 50.
The next digit of our result is 6. 
Result so far: 9159.6
Subtract 510 from 560 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.

Advancing to step 8:
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: 9159.65
Deduct 425 from 500 and we're left 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.

Moving on to step 9:
85 can be fit into 750 8 times, resulting in a remainder of 70.
Use 8 as the next digit of our solution. 
Result so far: 9159.658
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.

Going ahead to step 10:
85 can be fit into 700 8 times, resulting in a remainder of 20.
Record the quotient 8 as the next digit in the result. 
Result so far: 9159.6588
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.

After the division, we end up with 9159.6588 and a remainder of 0.0002.