We divide 663962 by 80
The aim is to understand the frequency of 80 in 663962.

Advancing to step 1:
6 divided by 80 is 0 with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Append the next digit (6) from the dividend to 6 and continue with: 66 / 80

On to step 2:
66 divided by 80 is 0 with a remainder of 66.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 66 leaves us with 66.
Include the next digit (3) from the dividend after 66, then repeat: 663 / 80

Moving on to step 3:
The number 80 fits into 663 8 times, leaving a remainder of 23.
Put 8 as the next digit of the answer. 
Result so far: 8.0
Deduct 640 from 663 and we're left with 23.
Bring next digit (9) of the dividend behind the 23 and repeat the process: 239 / 80

Going ahead to step 4:
When dividing 239 by 80, we get 2 with a remainder of 79.
Use 2 as the next digit of our solution. 
Result so far: 82.0
The remainder is 79 after subtracting 160 from 239.
Append the next digit (6) from the dividend to 79 and continue with: 796 / 80

On to step 5:
The number 80 fits into 796 9 times, leaving a remainder of 76.
The next digit of our result is 9. 
Result so far: 829.0
If we subtract 720 from 796, we get 76.
Include the next digit (2) from the dividend after 76, then repeat: 762 / 80

Let's proceed to step 6:
762 divided by 80 is 9 with a remainder of 42.
Write down 9 as next digit of the result. 
Result so far: 8299.0
Subtract 720 from 762 to get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Advancing to step 7:
80 goes into 420 5 times with a remainder of 20.
Write down 5 as next digit of the result. 
Result so far: 8299.5
Subtracting 400 from 420 leaves us 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.

Let's proceed to step 8:
200 divided by 80 is 2 with a remainder of 40.
Record the quotient 2 as the next digit in the result. 
Result so far: 8299.52
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.

Advancing to step 9:
When dividing 400 by 80, we get 5 with a remainder of 0.
The next digit of our result is 5. 
Result so far: 8299.525
If we subtract 400 from 400, 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.

Step 10:
If we divide 0 by 80, we get 0 and a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 8299.525
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:
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: 8299.525
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.

Our division results in 8299.525 with a remaining 0.0.