663917 ÷ 12 
We're looking to find how many times 12 goes into 663917.

Let's proceed to step 1:
The number 12 fits into 6 0 times, leaving a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Fetch the next digit (6) from the dividend, attach it to 6 and continue: 66 / 12

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.
Grab the next digit (3) from the dividend, add it to 6, then carry on: 63 / 12

Let's proceed to step 3:
When dividing 63 by 12, we get 5 with a remainder of 3.
Write down 5 as next digit of the result. 
Result so far: 55.0
If we take 60 away from 63, we end up with 3.
Grab the next digit (9) from the dividend, add it to 3, then carry on: 39 / 12

Step 4:
12 goes into 39 3 times with a remainder of 3.
The next digit of our result is 3. 
Result so far: 553.0
Subtract 36 from 39 to get 3.
Take the next digit (1) from the dividend and append it to 3, then repeat: 31 / 12

Let's proceed to step 5:
The number 12 fits into 31 2 times, leaving a remainder of 7.
The next digit of our result is 2. 
Result so far: 5532.0
Subtract 24 from 31 to get 7.
Grab the next digit (7) from the dividend, add it to 7, then carry on: 77 / 12

Step 6:
12 can be fit into 77 6 times, resulting in a remainder of 5.
The number 6 becomes the next digit in our result. 
Result so far: 55326.0
Subtracting 72 from 77 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

On to step 7:
12 can be fit into 50 4 times, resulting in a remainder of 2.
Record the quotient 4 as the next digit in the result. 
Result so far: 55326.4
Subtracting 48 from 50 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 8:
When dividing 20 by 12, we get 1 with a remainder of 8.
The next digit of our result is 1. 
Result so far: 55326.41
If we take 12 away from 20, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 9:
12 goes into 80 6 times with a remainder of 8.
Put 6 as the next digit of the answer. 
Result so far: 55326.416
Subtract 72 from 80 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Step 10:
If we divide 80 by 12, we get 6 and a remainder of 8.
Write down 6 as next digit of the result. 
Result so far: 55326.4166
If we take 72 away from 80, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

In conclusion, the division gives 55326.4166 with a balance of 8e-05.