We divide 603945 by 12
We want to divide 603945 by 12.

Going ahead to step 1:
12 can be fit into 6 0 times, resulting in a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Fetch the next digit (0) from the dividend, attach it to 6 and continue: 60 / 12

Going ahead to step 2:
12 can be fit into 60 5 times, resulting in a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
If we subtract 60 from 60, we get 0.
Grab the next digit (3) from the dividend, add it to 0, then carry on: 3 / 12

On to step 3:
If we divide 3 by 12, we get 0 and a remainder of 3.
The next digit of our result is 0. 
Result so far: 50.0
Subtracting 0 from 3 leaves us with 3.
Fetch the next digit (9) from the dividend, attach it to 3 and continue: 39 / 12

Step 4:
12 goes into 39 3 times with a remainder of 3.
Use 3 as the next digit of our solution. 
Result so far: 503.0
If we subtract 36 from 39, we get 3.
Fetch the next digit (4) from the dividend, attach it to 3 and continue: 34 / 12

Let's proceed to step 5:
34 divided by 12 is 2 with a remainder of 10.
Write down 2 as next digit of the result. 
Result so far: 5032.0
If we take 24 away from 34, we end up with 10.
Include the next digit (5) from the dividend after 10, then repeat: 105 / 12

Let's proceed to step 6:
12 can be fit into 105 8 times, resulting in a remainder of 9.
The number 8 becomes the next digit in our result. 
Result so far: 50328.0
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.

Going ahead to step 7:
When dividing 90 by 12, we get 7 with a remainder of 6.
Write down 7 as next digit of the result. 
Result so far: 50328.7
The remainder is 6 after subtracting 84 from 90.
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:
The number 12 fits into 60 5 times, leaving a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 50328.75
Deduct 60 from 60 and we're left 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.

Step 9:
12 goes into 0 0 times with a remainder of 0.
The next digit of our result is 0. 
Result so far: 50328.75
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.

On to step 10:
If we divide 0 by 12, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 50328.75
Deduct 0 from 0 and we're left 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.

The quotient of the division is 50328.75, and the remainder is 0.0.