We divide 645552 by 80
The aim is to understand the frequency of 80 in 645552.

Moving on to step 1:
If we divide 6 by 80, we get 0 and a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Append the next digit (4) from the dividend to 6 and continue with: 64 / 80

Let's proceed to step 2:
If we divide 64 by 80, we get 0 and a remainder of 64.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 64, we end up with 64.
Bring next digit (5) of the dividend behind the 64 and repeat the process: 645 / 80

Advancing to step 3:
When dividing 645 by 80, we get 8 with a remainder of 5.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
The remainder is 5 after subtracting 640 from 645.
Fetch the next digit (5) from the dividend, attach it to 5 and continue: 55 / 80

Going ahead to step 4:
The number 80 fits into 55 0 times, leaving a remainder of 55.
Put 0 as the next digit of the answer. 
Result so far: 80.0
If we subtract 0 from 55, we get 55.
Bring next digit (5) of the dividend behind the 55 and repeat the process: 555 / 80

Step 5:
80 goes into 555 6 times with a remainder of 75.
The number 6 becomes the next digit in our result. 
Result so far: 806.0
If we subtract 480 from 555, we get 75.
Take the next digit (2) from the dividend and append it to 75, then repeat: 752 / 80

Let's proceed to step 6:
When dividing 752 by 80, we get 9 with a remainder of 32.
Use 9 as the next digit of our solution. 
Result so far: 8069.0
Deduct 720 from 752 and we're left with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

On to step 7:
When dividing 320 by 80, we get 4 with a remainder of 0.
The number 4 becomes the next digit in our result. 
Result so far: 8069.4
If we take 320 away from 320, 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 8:
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: 8069.4
The remainder is 0 after subtracting 0 from 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 9:
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: 8069.4
The remainder is 0 after subtracting 0 from 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 final outcome is 8069.4, with a leftover of 0.0.