405240 ÷ 15 
Let's see how many times 15 fits into 405240.

Going ahead to step 1:
4 divided by 15 is 0 with a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 4, we get 4.
Fetch the next digit (0) from the dividend, attach it to 4 and continue: 40 / 15

Moving on to step 2:
15 can be fit into 40 2 times, resulting in a remainder of 10.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Subtract 30 from 40 to get 10.
Grab the next digit (5) from the dividend, add it to 10, then carry on: 105 / 15

Advancing to step 3:
15 can be fit into 105 7 times, resulting in a remainder of 0.
The number 7 becomes the next digit in our result. 
Result so far: 27.0
If we take 105 away from 105, we end up with 0.
Include the next digit (2) from the dividend after 0, then repeat: 2 / 15

Step 4:
If we divide 2 by 15, we get 0 and a remainder of 2.
The next digit of our result is 0. 
Result so far: 270.0
If we subtract 0 from 2, we get 2.
Take the next digit (4) from the dividend and append it to 2, then repeat: 24 / 15

On to step 5:
The number 15 fits into 24 1 times, leaving a remainder of 9.
Write down 1 as next digit of the result. 
Result so far: 2701.0
Deduct 15 from 24 and we're left with 9.
Append the next digit (0) from the dividend to 9 and continue with: 90 / 15

Advancing to step 6:
15 goes into 90 6 times with a remainder of 0.
The number 6 becomes the next digit in our result. 
Result so far: 27016.0
Subtract 90 from 90 to 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:
15 can be fit into 0 0 times, resulting in a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 27016.0
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.

Step 8:
0 divided by 15 is 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 27016.0
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.

The quotient of the division is 27016.0, and the remainder is 0.0.