We're dividing 666123 by 80 
Our goal is to divide 666123 by 80.

Advancing to step 1:
The number 80 fits into 6 0 times, leaving a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 80

Let's proceed to step 2:
When dividing 66 by 80, we get 0 with a remainder of 66.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 66 after subtracting 0 from 66.
Append the next digit (6) from the dividend to 66 and continue with: 666 / 80

Advancing to step 3:
80 can be fit into 666 8 times, resulting in a remainder of 26.
Use 8 as the next digit of our solution. 
Result so far: 8.0
Subtracting 640 from 666 leaves us with 26.
Take the next digit (1) from the dividend and append it to 26, then repeat: 261 / 80

Advancing to step 4:
If we divide 261 by 80, we get 3 and a remainder of 21.
Put 3 as the next digit of the answer. 
Result so far: 83.0
The remainder is 21 after subtracting 240 from 261.
Include the next digit (2) from the dividend after 21, then repeat: 212 / 80

Moving on to step 5:
If we divide 212 by 80, we get 2 and a remainder of 52.
Put 2 as the next digit of the answer. 
Result so far: 832.0
Subtract 160 from 212 to get 52.
Take the next digit (3) from the dividend and append it to 52, then repeat: 523 / 80

Step 6:
The number 80 fits into 523 6 times, leaving a remainder of 43.
Write down 6 as next digit of the result. 
Result so far: 8326.0
Subtracting 480 from 523 leaves us with 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Advancing to step 7:
When dividing 430 by 80, we get 5 with a remainder of 30.
The number 5 becomes the next digit in our result. 
Result so far: 8326.5
The remainder is 30 after subtracting 400 from 430.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Going ahead to step 8:
When dividing 300 by 80, we get 3 with a remainder of 60.
The number 3 becomes the next digit in our result. 
Result so far: 8326.53
Subtracting 240 from 300 leaves us 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.

Going ahead to step 9:
If we divide 600 by 80, we get 7 and a remainder of 40.
Put 7 as the next digit of the answer. 
Result so far: 8326.537
The remainder is 40 after subtracting 560 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Step 10:
80 can be fit into 400 5 times, resulting in a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 8326.5375
Subtracting 400 from 400 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.

Going ahead to step 11:
The number 80 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 8326.5375
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.

Going ahead to step 12:
The number 80 fits into 0 0 times, leaving a remainder of 0.
The next digit of our result is 0. 
Result so far: 8326.5375
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 final outcome is 8326.5375, with a leftover of 0.0.