Let's divide 661690 by 80
We want to divide 661690 by 80.

Going ahead to step 1:
6 divided by 80 is 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.
Fetch the next digit (6) from the dividend, attach it to 6 and continue: 66 / 80

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
If we take 0 away from 66, we end up with 66.
Take the next digit (1) from the dividend and append it to 66, then repeat: 661 / 80

Advancing to step 3:
80 goes into 661 8 times with a remainder of 21.
Write down 8 as next digit of the result. 
Result so far: 8.0
Subtract 640 from 661 to get 21.
Fetch the next digit (6) from the dividend, attach it to 21 and continue: 216 / 80

Let's proceed to step 4:
If we divide 216 by 80, we get 2 and a remainder of 56.
The next digit of our result is 2. 
Result so far: 82.0
If we take 160 away from 216, we end up with 56.
Take the next digit (9) from the dividend and append it to 56, then repeat: 569 / 80

Going ahead to step 5:
80 goes into 569 7 times with a remainder of 9.
The number 7 becomes the next digit in our result. 
Result so far: 827.0
If we subtract 560 from 569, we get 9.
Append the next digit (0) from the dividend to 9 and continue with: 90 / 80

Advancing to step 6:
If we divide 90 by 80, we get 1 and a remainder of 10.
Use 1 as the next digit of our solution. 
Result so far: 8271.0
Subtract 80 from 90 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.

Let's proceed to step 7:
80 goes into 100 1 times with a remainder of 20.
The next digit of our result is 1. 
Result so far: 8271.1
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.

Going ahead to step 8:
200 divided by 80 is 2 with a remainder of 40.
The next digit of our result is 2. 
Result so far: 8271.12
If we subtract 160 from 200, we get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Moving on to step 9:
400 divided by 80 is 5 with a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 8271.125
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.

Moving on to step 10:
When dividing 0 by 80, we get 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 8271.125
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.

On to step 11:
If we divide 0 by 80, we get 0 and a remainder of 0.
The next digit of our result is 0. 
Result so far: 8271.125
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.

Our division results in 8271.125 with a remaining 0.0.