621288 ÷ 12 
Our goal is to divide 621288 by 12.

Let's proceed to step 1:
6 divided by 12 is 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Fetch the next digit (2) from the dividend, attach it to 6 and continue: 62 / 12

Step 2:
12 goes into 62 5 times with a remainder of 2.
Put 5 as the next digit of the answer. 
Result so far: 5.0
The remainder is 2 after subtracting 60 from 62.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 12

On to step 3:
12 goes into 21 1 times with a remainder of 9.
Write down 1 as next digit of the result. 
Result so far: 51.0
The remainder is 9 after subtracting 12 from 21.
Take the next digit (2) from the dividend and append it to 9, then repeat: 92 / 12

Step 4:
92 divided by 12 is 7 with a remainder of 8.
Use 7 as the next digit of our solution. 
Result so far: 517.0
Subtracting 84 from 92 leaves us with 8.
Include the next digit (8) from the dividend after 8, then repeat: 88 / 12

Advancing to step 5:
The number 12 fits into 88 7 times, leaving a remainder of 4.
Record the quotient 7 as the next digit in the result. 
Result so far: 5177.0
If we subtract 84 from 88, we get 4.
Take the next digit (8) from the dividend and append it to 4, then repeat: 48 / 12

On to step 6:
The number 12 fits into 48 4 times, leaving a remainder of 0.
Write down 4 as next digit of the result. 
Result so far: 51774.0
The remainder is 0 after subtracting 48 from 48.
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 7:
The number 12 fits into 0 0 times, leaving a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 51774.0
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.

Moving on to step 8:
0 divided by 12 is 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 51774.0
If we take 0 away from 0, we end up 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.

After the division, we end up with 51774.0 and a remainder of 0.0.