We're dividing 645797 by 80 
The aim is to understand the frequency of 80 in 645797.

Let's proceed to step 1:
80 can be fit into 6 0 times, resulting in a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Bring next digit (4) of the dividend behind the 6 and repeat the process: 64 / 80

Advancing to step 2:
When dividing 64 by 80, we get 0 with a remainder of 64.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 64 to get 64.
Grab the next digit (5) from the dividend, add it to 64, then carry on: 645 / 80

Going ahead to step 3:
80 can be fit into 645 8 times, resulting in a remainder of 5.
Write down 8 as next digit of the result. 
Result so far: 8.0
If we take 640 away from 645, we end up with 5.
Include the next digit (7) from the dividend after 5, then repeat: 57 / 80

Moving on to step 4:
When dividing 57 by 80, we get 0 with a remainder of 57.
Record the quotient 0 as the next digit in the result. 
Result so far: 80.0
The remainder is 57 after subtracting 0 from 57.
Bring next digit (9) of the dividend behind the 57 and repeat the process: 579 / 80

Advancing to step 5:
80 can be fit into 579 7 times, resulting in a remainder of 19.
The number 7 becomes the next digit in our result. 
Result so far: 807.0
If we subtract 560 from 579, we get 19.
Append the next digit (7) from the dividend to 19 and continue with: 197 / 80

Step 6:
If we divide 197 by 80, we get 2 and a remainder of 37.
The next digit of our result is 2. 
Result so far: 8072.0
The remainder is 37 after subtracting 160 from 197.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Let's proceed to step 7:
The number 80 fits into 370 4 times, leaving a remainder of 50.
The next digit of our result is 4. 
Result so far: 8072.4
If we subtract 320 from 370, we get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Let's proceed to step 8:
80 can be fit into 500 6 times, resulting in a remainder of 20.
The number 6 becomes the next digit in our result. 
Result so far: 8072.46
Deduct 480 from 500 and we're left with 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.
Write down 2 as next digit of the result. 
Result so far: 8072.462
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.

Moving on to step 10:
The number 80 fits into 400 5 times, leaving a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 8072.4625
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.

Let's proceed to step 11:
If we divide 0 by 80, we get 0 and a remainder of 0.
The next digit of our result is 0. 
Result so far: 8072.4625
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:
0 divided by 80 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 8072.4625
If we subtract 0 from 0, we 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.

The quotient of the division is 8072.4625, and the remainder is 0.0.