We look at the division of 831985 by 80 
The aim is to understand the frequency of 80 in 831985.

Step 1:
80 can be fit into 8 0 times, resulting in a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Take the next digit (3) from the dividend and append it to 8, then repeat: 83 / 80

Moving on to step 2:
When dividing 83 by 80, we get 1 with a remainder of 3.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we subtract 80 from 83, we get 3.
Include the next digit (1) from the dividend after 3, then repeat: 31 / 80

Step 3:
If we divide 31 by 80, we get 0 and a remainder of 31.
Put 0 as the next digit of the answer. 
Result so far: 10.0
If we take 0 away from 31, we end up with 31.
Append the next digit (9) from the dividend to 31 and continue with: 319 / 80

Advancing to step 4:
319 divided by 80 is 3 with a remainder of 79.
Use 3 as the next digit of our solution. 
Result so far: 103.0
Subtract 240 from 319 to get 79.
Append the next digit (8) from the dividend to 79 and continue with: 798 / 80

On to step 5:
If we divide 798 by 80, we get 9 and a remainder of 78.
The next digit of our result is 9. 
Result so far: 1039.0
The remainder is 78 after subtracting 720 from 798.
Take the next digit (5) from the dividend and append it to 78, then repeat: 785 / 80

Advancing to step 6:
80 can be fit into 785 9 times, resulting in a remainder of 65.
Use 9 as the next digit of our solution. 
Result so far: 10399.0
Subtracting 720 from 785 leaves us with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Moving on to step 7:
If we divide 650 by 80, we get 8 and a remainder of 10.
The next digit of our result is 8. 
Result so far: 10399.8
Deduct 640 from 650 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.

Let's proceed to step 8:
80 can be fit into 100 1 times, resulting in a remainder of 20.
Write down 1 as next digit of the result. 
Result so far: 10399.81
If we subtract 80 from 100, 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.

Going ahead to step 9:
When dividing 200 by 80, we get 2 with a remainder of 40.
Use 2 as the next digit of our solution. 
Result so far: 10399.812
Subtracting 160 from 200 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.

Step 10:
80 goes into 400 5 times with a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 10399.8125
Subtracting 400 from 400 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 11:
When dividing 0 by 80, we get 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 10399.8125
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 12:
When dividing 0 by 80, we get 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 10399.8125
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 10399.8125, with a leftover of 0.0.