We look at the division of 12456331 by 603 
Let's see how many times 603 fits into 12456331.

Let's proceed to step 1:
The number 603 fits into 1 0 times, leaving a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Grab the next digit (2) from the dividend, add it to 1, then carry on: 12 / 603

Let's proceed to step 2:
When dividing 12 by 603, we get 0 with a remainder of 12.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 12 and we're left with 12.
Bring next digit (4) of the dividend behind the 12 and repeat the process: 124 / 603

Moving on to step 3:
When dividing 124 by 603, we get 0 with a remainder of 124.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 124, we end up with 124.
Bring next digit (5) of the dividend behind the 124 and repeat the process: 1245 / 603

On to step 4:
The number 603 fits into 1245 2 times, leaving a remainder of 39.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Subtracting 1206 from 1245 leaves us with 39.
Fetch the next digit (6) from the dividend, attach it to 39 and continue: 396 / 603

Moving on to step 5:
If we divide 396 by 603, we get 0 and a remainder of 396.
Write down 0 as next digit of the result. 
Result so far: 20.0
If we take 0 away from 396, we end up with 396.
Take the next digit (3) from the dividend and append it to 396, then repeat: 3963 / 603

Advancing to step 6:
3963 divided by 603 is 6 with a remainder of 345.
The next digit of our result is 6. 
Result so far: 206.0
If we subtract 3618 from 3963, we get 345.
Include the next digit (3) from the dividend after 345, then repeat: 3453 / 603

Advancing to step 7:
603 can be fit into 3453 5 times, resulting in a remainder of 438.
Record the quotient 5 as the next digit in the result. 
Result so far: 2065.0
Subtract 3015 from 3453 to get 438.
Include the next digit (1) from the dividend after 438, then repeat: 4381 / 603

Advancing to step 8:
4381 divided by 603 is 7 with a remainder of 160.
Put 7 as the next digit of the answer. 
Result so far: 20657.0
If we take 4221 away from 4381, we end up with 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Moving on to step 9:
1600 divided by 603 is 2 with a remainder of 394.
Use 2 as the next digit of our solution. 
Result so far: 20657.2
If we take 1206 away from 1600, we end up with 394.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3940, and continue the process.

Step 10:
603 goes into 3940 6 times with a remainder of 322.
Use 6 as the next digit of our solution. 
Result so far: 20657.26
If we take 3618 away from 3940, we end up with 322.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3220, and continue the process.

On to step 11:
The number 603 fits into 3220 5 times, leaving a remainder of 205.
The number 5 becomes the next digit in our result. 
Result so far: 20657.265
Deduct 3015 from 3220 and we're left with 205.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2050, and continue the process.

Going ahead to step 12:
2050 divided by 603 is 3 with a remainder of 241.
The next digit of our result is 3. 
Result so far: 20657.2653
If we subtract 1809 from 2050, we get 241.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2410, and continue the process.

Moving on to step 13:
2410 divided by 603 is 3 with a remainder of 601.
Put 3 as the next digit of the answer. 
Result so far: 20657.26533
Deduct 1809 from 2410 and we're left with 601.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6010, and continue the process.

In conclusion, the division gives 20657.26533 with a balance of 0.000601.