We're dividing 661680 by 12 
We want to divide 661680 by 12.

Moving on to step 1:
The number 12 fits into 6 0 times, leaving a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Append the next digit (6) from the dividend to 6 and continue with: 66 / 12

Moving on to step 2:
When dividing 66 by 12, we get 5 with a remainder of 6.
Write down 5 as next digit of the result. 
Result so far: 5.0
If we take 60 away from 66, we end up with 6.
Take the next digit (1) from the dividend and append it to 6, then repeat: 61 / 12

Moving on to step 3:
12 goes into 61 5 times with a remainder of 1.
The number 5 becomes the next digit in our result. 
Result so far: 55.0
If we take 60 away from 61, we end up with 1.
Include the next digit (6) from the dividend after 1, then repeat: 16 / 12

Advancing to step 4:
The number 12 fits into 16 1 times, leaving a remainder of 4.
Put 1 as the next digit of the answer. 
Result so far: 551.0
Subtract 12 from 16 to get 4.
Grab the next digit (8) from the dividend, add it to 4, then carry on: 48 / 12

Let's proceed to step 5:
48 divided by 12 is 4 with a remainder of 0.
Record the quotient 4 as the next digit in the result. 
Result so far: 5514.0
Subtracting 48 from 48 leaves us with 0.
Fetch the next digit (0) from the dividend, attach it to 0 and continue: 0 / 12

On to step 6:
If we divide 0 by 12, we get 0 and a remainder of 0.
The next digit of our result is 0. 
Result so far: 55140.0
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.

On to step 7:
0 divided by 12 is 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 55140.0
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.

Going ahead to step 8:
0 divided by 12 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 55140.0
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 quotient of the division is 55140.0, and the remainder is 0.0.