Let's divide 817394 by 80
The aim is to understand the frequency of 80 in 817394.

Step 1:
When dividing 8 by 80, we get 0 with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Append the next digit (1) from the dividend to 8 and continue with: 81 / 80

Going ahead to step 2:
81 divided by 80 is 1 with a remainder of 1.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 80 from 81 to get 1.
Include the next digit (7) from the dividend after 1, then repeat: 17 / 80

On to step 3:
If we divide 17 by 80, we get 0 and a remainder of 17.
Record the quotient 0 as the next digit in the result. 
Result so far: 10.0
Subtract 0 from 17 to get 17.
Append the next digit (3) from the dividend to 17 and continue with: 173 / 80

Advancing to step 4:
If we divide 173 by 80, we get 2 and a remainder of 13.
Put 2 as the next digit of the answer. 
Result so far: 102.0
If we subtract 160 from 173, we get 13.
Fetch the next digit (9) from the dividend, attach it to 13 and continue: 139 / 80

Going ahead to step 5:
139 divided by 80 is 1 with a remainder of 59.
Put 1 as the next digit of the answer. 
Result so far: 1021.0
If we subtract 80 from 139, we get 59.
Take the next digit (4) from the dividend and append it to 59, then repeat: 594 / 80

Moving on to step 6:
594 divided by 80 is 7 with a remainder of 34.
The next digit of our result is 7. 
Result so far: 10217.0
Deduct 560 from 594 and we're left with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Step 7:
80 goes into 340 4 times with a remainder of 20.
Write down 4 as next digit of the result. 
Result so far: 10217.4
If we subtract 320 from 340, 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 8:
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: 10217.42
Subtract 160 from 200 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.

Advancing to step 9:
80 goes into 400 5 times with a remainder of 0.
The next digit of our result is 5. 
Result so far: 10217.425
Deduct 400 from 400 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.

On to step 10:
The number 80 fits into 0 0 times, leaving a remainder of 0.
The next digit of our result is 0. 
Result so far: 10217.425
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.

Going ahead to step 11:
If we divide 0 by 80, we get 0 and a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 10217.425
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.

Our division results in 10217.425 with a remaining 0.0.