645655 ÷ 12 
We're looking to find how many times 12 goes into 645655.

Advancing to step 1:
When dividing 6 by 12, we get 0 with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Grab the next digit (4) from the dividend, add it to 6, then carry on: 64 / 12

Let's proceed to step 2:
The number 12 fits into 64 5 times, leaving a remainder of 4.
The number 5 becomes the next digit in our result. 
Result so far: 5.0
Subtract 60 from 64 to get 4.
Bring next digit (5) of the dividend behind the 4 and repeat the process: 45 / 12

Going ahead to step 3:
45 divided by 12 is 3 with a remainder of 9.
The number 3 becomes the next digit in our result. 
Result so far: 53.0
If we take 36 away from 45, we end up with 9.
Grab the next digit (6) from the dividend, add it to 9, then carry on: 96 / 12

Moving on to step 4:
12 goes into 96 8 times with a remainder of 0.
The next digit of our result is 8. 
Result so far: 538.0
If we take 96 away from 96, we end up with 0.
Fetch the next digit (5) from the dividend, attach it to 0 and continue: 5 / 12

Advancing to step 5:
The number 12 fits into 5 0 times, leaving a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 5380.0
Subtracting 0 from 5 leaves us with 5.
Append the next digit (5) from the dividend to 5 and continue with: 55 / 12

Step 6:
The number 12 fits into 55 4 times, leaving a remainder of 7.
Write down 4 as next digit of the result. 
Result so far: 53804.0
If we take 48 away from 55, we end up with 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 number 5 becomes the next digit in our result. 
Result so far: 53804.5
The remainder is 10 after subtracting 60 from 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 8:
When dividing 100 by 12, we get 8 with a remainder of 4.
Write down 8 as next digit of the result. 
Result so far: 53804.58
The remainder is 4 after subtracting 96 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 9:
When dividing 40 by 12, we get 3 with a remainder of 4.
Use 3 as the next digit of our solution. 
Result so far: 53804.583
If we take 36 away from 40, we end up 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.

Moving on to step 10:
If we divide 40 by 12, we get 3 and a remainder of 4.
Put 3 as the next digit of the answer. 
Result so far: 53804.5833
Subtract 36 from 40 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.

In conclusion, the division gives 53804.5833 with a balance of 4e-05.