We're dividing 666487 by 12 
Let's see how many times 12 fits into 666487.

Let's proceed to step 1:
When dividing 6 by 12, we get 0 with a remainder of 6.
Use 0 as the next digit of our solution. 
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 / 12

Going ahead to step 2:
12 goes into 66 5 times with a remainder of 6.
The number 5 becomes the next digit in our result. 
Result so far: 5.0
If we subtract 60 from 66, we get 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 12

On to step 3:
The number 12 fits into 66 5 times, leaving a remainder of 6.
Use 5 as the next digit of our solution. 
Result so far: 55.0
The remainder is 6 after subtracting 60 from 66.
Bring next digit (4) of the dividend behind the 6 and repeat the process: 64 / 12

Let's proceed to step 4:
12 goes into 64 5 times with a remainder of 4.
The number 5 becomes the next digit in our result. 
Result so far: 555.0
Subtracting 60 from 64 leaves us with 4.
Fetch the next digit (8) from the dividend, attach it to 4 and continue: 48 / 12

Let's proceed to step 5:
48 divided by 12 is 4 with a remainder of 0.
Write down 4 as next digit of the result. 
Result so far: 5554.0
If we subtract 48 from 48, we get 0.
Fetch the next digit (7) from the dividend, attach it to 0 and continue: 7 / 12

Moving on to step 6:
12 can be fit into 7 0 times, resulting in a remainder of 7.
The next digit of our result is 0. 
Result so far: 55540.0
The remainder is 7 after subtracting 0 from 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Advancing to step 7:
12 can be fit into 70 5 times, resulting in a remainder of 10.
The next digit of our result is 5. 
Result so far: 55540.5
If we subtract 60 from 70, we 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.

On to step 8:
100 divided by 12 is 8 with a remainder of 4.
Write down 8 as next digit of the result. 
Result so far: 55540.58
Subtract 96 from 100 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 9:
12 can be fit into 40 3 times, resulting in a remainder of 4.
Use 3 as the next digit of our solution. 
Result so far: 55540.583
Subtracting 36 from 40 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 10:
40 divided by 12 is 3 with a remainder of 4.
Use 3 as the next digit of our solution. 
Result so far: 55540.5833
Deduct 36 from 40 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

The final result is 55540.5833 with a remainder of 4e-05.