668305 divided by 80 
Our goal is to divide 668305 by 80.

Let's proceed to step 1:
80 goes into 6 0 times with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Take the next digit (6) from the dividend and append it to 6, then repeat: 66 / 80

On to step 2:
When dividing 66 by 80, we get 0 with a remainder of 66.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 66 leaves us with 66.
Fetch the next digit (8) from the dividend, attach it to 66 and continue: 668 / 80

Moving on to step 3:
80 can be fit into 668 8 times, resulting in a remainder of 28.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
Deduct 640 from 668 and we're left with 28.
Take the next digit (3) from the dividend and append it to 28, then repeat: 283 / 80

Going ahead to step 4:
80 can be fit into 283 3 times, resulting in a remainder of 43.
Use 3 as the next digit of our solution. 
Result so far: 83.0
Deduct 240 from 283 and we're left with 43.
Take the next digit (0) from the dividend and append it to 43, then repeat: 430 / 80

Going ahead to step 5:
80 can be fit into 430 5 times, resulting in a remainder of 30.
Record the quotient 5 as the next digit in the result. 
Result so far: 835.0
If we subtract 400 from 430, we get 30.
Grab the next digit (5) from the dividend, add it to 30, then carry on: 305 / 80

Going ahead to step 6:
When dividing 305 by 80, we get 3 with a remainder of 65.
Put 3 as the next digit of the answer. 
Result so far: 8353.0
If we subtract 240 from 305, we get 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Advancing to step 7:
The number 80 fits into 650 8 times, leaving a remainder of 10.
Record the quotient 8 as the next digit in the result. 
Result so far: 8353.8
Subtract 640 from 650 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 8:
The number 80 fits into 100 1 times, leaving a remainder of 20.
Record the quotient 1 as the next digit in the result. 
Result so far: 8353.81
Subtract 80 from 100 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 9:
When dividing 200 by 80, we get 2 with a remainder of 40.
Record the quotient 2 as the next digit in the result. 
Result so far: 8353.812
Deduct 160 from 200 and we're left 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.

Going ahead to step 10:
The number 80 fits into 400 5 times, leaving a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 8353.8125
Subtract 400 from 400 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 11:
When dividing 0 by 80, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 8353.8125
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.

Moving on to step 12:
0 divided by 80 is 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 8353.8125
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.

The final outcome is 8353.8125, with a leftover of 0.0.