840890 ÷ 85 
The aim is to understand the frequency of 85 in 840890.

Advancing to step 1:
When dividing 8 by 85, we get 0 with a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Include the next digit (4) from the dividend after 8, then repeat: 84 / 85

Let's proceed to step 2:
85 goes into 84 0 times with a remainder of 84.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 84 leaves us with 84.
Take the next digit (0) from the dividend and append it to 84, then repeat: 840 / 85

Step 3:
The number 85 fits into 840 9 times, leaving a remainder of 75.
The next digit of our result is 9. 
Result so far: 9.0
Subtracting 765 from 840 leaves us with 75.
Include the next digit (8) from the dividend after 75, then repeat: 758 / 85

Going ahead to step 4:
758 divided by 85 is 8 with a remainder of 78.
Use 8 as the next digit of our solution. 
Result so far: 98.0
Subtracting 680 from 758 leaves us with 78.
Grab the next digit (9) from the dividend, add it to 78, then carry on: 789 / 85

Moving on to step 5:
The number 85 fits into 789 9 times, leaving a remainder of 24.
The next digit of our result is 9. 
Result so far: 989.0
Subtract 765 from 789 to get 24.
Include the next digit (0) from the dividend after 24, then repeat: 240 / 85

Step 6:
85 can be fit into 240 2 times, resulting in a remainder of 70.
Write down 2 as next digit of the result. 
Result so far: 9892.0
Subtracting 170 from 240 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.

Moving on to step 7:
85 can be fit into 700 8 times, resulting in a remainder of 20.
Use 8 as the next digit of our solution. 
Result so far: 9892.8
Subtract 680 from 700 to 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.

Advancing to step 8:
85 can be fit into 200 2 times, resulting in a remainder of 30.
The number 2 becomes the next digit in our result. 
Result so far: 9892.82
Deduct 170 from 200 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Going ahead to step 9:
85 can be fit into 300 3 times, resulting in a remainder of 45.
The next digit of our result is 3. 
Result so far: 9892.823
If we subtract 255 from 300, we 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.

Advancing to step 10:
85 can be fit into 450 5 times, resulting in a remainder of 25.
The next digit of our result is 5. 
Result so far: 9892.8235
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.

Advancing to step 11:
If we divide 250 by 85, we get 2 and a remainder of 80.
Use 2 as the next digit of our solution. 
Result so far: 9892.82352
If we subtract 170 from 250, we get 80.
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.
Put 9 as the next digit of the answer. 
Result so far: 9892.823529
Subtract 765 from 800 to get 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Going ahead to step 13:
85 goes into 350 4 times with a remainder of 10.
Write down 4 as next digit of the result. 
Result so far: 9892.8235294
Deduct 340 from 350 and we're left 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.

Going ahead to step 14:
85 can be fit into 100 1 times, resulting in a remainder of 15.
Write down 1 as next digit of the result. 
Result so far: 9892.82352941
If we take 85 away from 100, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

The final result is 9892.82352941 with a remainder of 1.5e-08.