We look at the division of 661665 by 12 
We want to divide 661665 by 12.

Going ahead to step 1:
If we divide 6 by 12, we get 0 and a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Include the next digit (6) from the dividend after 6, then repeat: 66 / 12

On to step 2:
When dividing 66 by 12, we get 5 with a remainder of 6.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
Subtract 60 from 66 to get 6.
Append the next digit (1) from the dividend to 6 and continue with: 61 / 12

Step 3:
The number 12 fits into 61 5 times, leaving a remainder of 1.
Record the quotient 5 as the next digit in the result. 
Result so far: 55.0
Deduct 60 from 61 and we're left with 1.
Include the next digit (6) from the dividend after 1, then repeat: 16 / 12

Moving on to step 4:
If we divide 16 by 12, we get 1 and a remainder of 4.
Use 1 as the next digit of our solution. 
Result so far: 551.0
The remainder is 4 after subtracting 12 from 16.
Fetch the next digit (6) from the dividend, attach it to 4 and continue: 46 / 12

Going ahead to step 5:
The number 12 fits into 46 3 times, leaving a remainder of 10.
Use 3 as the next digit of our solution. 
Result so far: 5513.0
The remainder is 10 after subtracting 36 from 46.
Append the next digit (5) from the dividend to 10 and continue with: 105 / 12

On to step 6:
If we divide 105 by 12, we get 8 and a remainder of 9.
Put 8 as the next digit of the answer. 
Result so far: 55138.0
Subtract 96 from 105 to get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Step 7:
The number 12 fits into 90 7 times, leaving a remainder of 6.
The number 7 becomes the next digit in our result. 
Result so far: 55138.7
Deduct 84 from 90 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Step 8:
12 goes into 60 5 times with a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 55138.75
Subtracting 60 from 60 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.

Let's proceed to step 9:
If we divide 0 by 12, we get 0 and a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 55138.75
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.

Going ahead to step 10:
If we divide 0 by 12, we get 0 and a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 55138.75
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 result is 55138.75 with a remainder of 0.0.