We're dividing 668143 by 80 
The aim is to understand the frequency of 80 in 668143.

Let's proceed to step 1:
When dividing 6 by 80, we get 0 with 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 (6) from the dividend to 6 and continue with: 66 / 80

Moving on to step 2:
The number 80 fits into 66 0 times, leaving a remainder of 66.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 66 after subtracting 0 from 66.
Fetch the next digit (8) from the dividend, attach it to 66 and continue: 668 / 80

Moving on to step 3:
668 divided by 80 is 8 with a remainder of 28.
Put 8 as the next digit of the answer. 
Result so far: 8.0
The remainder is 28 after subtracting 640 from 668.
Grab the next digit (1) from the dividend, add it to 28, then carry on: 281 / 80

Moving on to step 4:
When dividing 281 by 80, we get 3 with a remainder of 41.
The number 3 becomes the next digit in our result. 
Result so far: 83.0
Deduct 240 from 281 and we're left with 41.
Bring next digit (4) of the dividend behind the 41 and repeat the process: 414 / 80

Advancing to step 5:
The number 80 fits into 414 5 times, leaving a remainder of 14.
Use 5 as the next digit of our solution. 
Result so far: 835.0
The remainder is 14 after subtracting 400 from 414.
Bring next digit (3) of the dividend behind the 14 and repeat the process: 143 / 80

Advancing to step 6:
80 can be fit into 143 1 times, resulting in a remainder of 63.
Use 1 as the next digit of our solution. 
Result so far: 8351.0
Subtracting 80 from 143 leaves us with 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Moving on to step 7:
630 divided by 80 is 7 with a remainder of 70.
Put 7 as the next digit of the answer. 
Result so far: 8351.7
If we take 560 away from 630, we end up with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

On to step 8:
When dividing 700 by 80, we get 8 with a remainder of 60.
The next digit of our result is 8. 
Result so far: 8351.78
If we take 640 away from 700, we end up with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

On to step 9:
80 goes into 600 7 times with a remainder of 40.
The next digit of our result is 7. 
Result so far: 8351.787
If we take 560 away from 600, we end up with 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 10:
80 goes into 400 5 times with a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 8351.7875
If we take 400 away from 400, 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.

Let's proceed to step 11:
80 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 8351.7875
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.

Advancing to step 12:
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: 8351.7875
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.

Our division results in 8351.7875 with a remaining 0.0.