810789 ÷ 80 
The aim is to understand the frequency of 80 in 810789.

On to step 1:
80 can be fit into 8 0 times, resulting in a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Fetch the next digit (1) from the dividend, attach it to 8 and continue: 81 / 80

Moving on to step 2:
80 goes into 81 1 times with a remainder of 1.
Use 1 as the next digit of our solution. 
Result so far: 1.0
The remainder is 1 after subtracting 80 from 81.
Grab the next digit (0) from the dividend, add it to 1, then carry on: 10 / 80

Going ahead to step 3:
The number 80 fits into 10 0 times, leaving a remainder of 10.
The next digit of our result is 0. 
Result so far: 10.0
Subtracting 0 from 10 leaves us with 10.
Include the next digit (7) from the dividend after 10, then repeat: 107 / 80

On to step 4:
The number 80 fits into 107 1 times, leaving a remainder of 27.
Record the quotient 1 as the next digit in the result. 
Result so far: 101.0
If we take 80 away from 107, we end up with 27.
Take the next digit (8) from the dividend and append it to 27, then repeat: 278 / 80

On to step 5:
80 can be fit into 278 3 times, resulting in a remainder of 38.
Use 3 as the next digit of our solution. 
Result so far: 1013.0
If we subtract 240 from 278, we get 38.
Grab the next digit (9) from the dividend, add it to 38, then carry on: 389 / 80

Moving on to step 6:
80 can be fit into 389 4 times, resulting in a remainder of 69.
Write down 4 as next digit of the result. 
Result so far: 10134.0
If we take 320 away from 389, we end up with 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Advancing to step 7:
When dividing 690 by 80, we get 8 with a remainder of 50.
Record the quotient 8 as the next digit in the result. 
Result so far: 10134.8
The remainder is 50 after subtracting 640 from 690.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Step 8:
80 can be fit into 500 6 times, resulting in a remainder of 20.
Write down 6 as next digit of the result. 
Result so far: 10134.86
If we subtract 480 from 500, 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.

On to step 9:
The number 80 fits into 200 2 times, leaving a remainder of 40.
Use 2 as the next digit of our solution. 
Result so far: 10134.862
The remainder is 40 after subtracting 160 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

On to step 10:
80 goes into 400 5 times with a remainder of 0.
The next digit of our result is 5. 
Result so far: 10134.8625
Subtract 400 from 400 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 11:
If we divide 0 by 80, we get 0 and a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 10134.8625
Subtract 0 from 0 to get 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:
80 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 10134.8625
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.

The quotient of the division is 10134.8625, and the remainder is 0.0.