We're dividing 865830 by 80 
The aim is to understand the frequency of 80 in 865830.

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
The remainder is 8 after subtracting 0 from 8.
Fetch the next digit (6) from the dividend, attach it to 8 and continue: 86 / 80

Moving on to step 2:
80 goes into 86 1 times with a remainder of 6.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtract 80 from 86 to get 6.
Take the next digit (5) from the dividend and append it to 6, then repeat: 65 / 80

On to step 3:
65 divided by 80 is 0 with a remainder of 65.
Record the quotient 0 as the next digit in the result. 
Result so far: 10.0
The remainder is 65 after subtracting 0 from 65.
Grab the next digit (8) from the dividend, add it to 65, then carry on: 658 / 80

Let's proceed to step 4:
80 goes into 658 8 times with a remainder of 18.
The next digit of our result is 8. 
Result so far: 108.0
Deduct 640 from 658 and we're left with 18.
Append the next digit (3) from the dividend to 18 and continue with: 183 / 80

Moving on to step 5:
When dividing 183 by 80, we get 2 with a remainder of 23.
Use 2 as the next digit of our solution. 
Result so far: 1082.0
Subtract 160 from 183 to get 23.
Grab the next digit (0) from the dividend, add it to 23, then carry on: 230 / 80

Step 6:
The number 80 fits into 230 2 times, leaving a remainder of 70.
The number 2 becomes the next digit in our result. 
Result so far: 10822.0
If we take 160 away from 230, 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 7:
If we divide 700 by 80, we get 8 and a remainder of 60.
Use 8 as the next digit of our solution. 
Result so far: 10822.8
Subtracting 640 from 700 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 8:
When dividing 600 by 80, we get 7 with a remainder of 40.
Use 7 as the next digit of our solution. 
Result so far: 10822.87
Subtract 560 from 600 to get 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 9:
If we divide 400 by 80, we get 5 and a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 10822.875
The remainder is 0 after subtracting 400 from 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 10:
If we divide 0 by 80, we get 0 and a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 10822.875
If we take 0 away from 0, we end up 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.

Advancing to step 11:
When dividing 0 by 80, we get 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 10822.875
Deduct 0 from 0 and we're left 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.

The quotient of the division is 10822.875, and the remainder is 0.0.