We divide 555420 by 12
We want to divide 555420 by 12.

Step 1:
If we divide 5 by 12, we get 0 and a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Include the next digit (5) from the dividend after 5, then repeat: 55 / 12

On to step 2:
If we divide 55 by 12, we get 4 and a remainder of 7.
The next digit of our result is 4. 
Result so far: 4.0
If we subtract 48 from 55, we get 7.
Fetch the next digit (5) from the dividend, attach it to 7 and continue: 75 / 12

Step 3:
75 divided by 12 is 6 with a remainder of 3.
The next digit of our result is 6. 
Result so far: 46.0
If we take 72 away from 75, we end up with 3.
Fetch the next digit (4) from the dividend, attach it to 3 and continue: 34 / 12

Moving on to step 4:
12 goes into 34 2 times with a remainder of 10.
The next digit of our result is 2. 
Result so far: 462.0
If we subtract 24 from 34, we get 10.
Fetch the next digit (2) from the dividend, attach it to 10 and continue: 102 / 12

Advancing to step 5:
The number 12 fits into 102 8 times, leaving a remainder of 6.
Write down 8 as next digit of the result. 
Result so far: 4628.0
The remainder is 6 after subtracting 96 from 102.
Bring next digit (0) of the dividend behind the 6 and repeat the process: 60 / 12

Moving on to step 6:
The number 12 fits into 60 5 times, leaving a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 46285.0
If we subtract 60 from 60, 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.

Going ahead to step 7:
0 divided by 12 is 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 46285.0
The remainder is 0 after subtracting 0 from 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 8:
0 divided by 12 is 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 46285.0
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 outcome is 46285.0, with a leftover of 0.0.