402309 divided by 15 
Our goal is to divide 402309 by 15.

On to step 1:
When dividing 4 by 15, we get 0 with a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Bring next digit (0) of the dividend behind the 4 and repeat the process: 40 / 15

Going ahead to step 2:
The number 15 fits into 40 2 times, leaving a remainder of 10.
Put 2 as the next digit of the answer. 
Result so far: 2.0
If we subtract 30 from 40, we get 10.
Include the next digit (2) from the dividend after 10, then repeat: 102 / 15

Let's proceed to step 3:
15 goes into 102 6 times with a remainder of 12.
Put 6 as the next digit of the answer. 
Result so far: 26.0
If we take 90 away from 102, we end up with 12.
Fetch the next digit (3) from the dividend, attach it to 12 and continue: 123 / 15

Advancing to step 4:
123 divided by 15 is 8 with a remainder of 3.
The number 8 becomes the next digit in our result. 
Result so far: 268.0
The remainder is 3 after subtracting 120 from 123.
Take the next digit (0) from the dividend and append it to 3, then repeat: 30 / 15

On to step 5:
15 goes into 30 2 times with a remainder of 0.
Use 2 as the next digit of our solution. 
Result so far: 2682.0
Subtracting 30 from 30 leaves us with 0.
Append the next digit (9) from the dividend to 0 and continue with: 9 / 15

Advancing to step 6:
The number 15 fits into 9 0 times, leaving a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 26820.0
If we take 0 away from 9, we end up with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Advancing to step 7:
15 can be fit into 90 6 times, resulting in a remainder of 0.
The next digit of our result is 6. 
Result so far: 26820.6
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.

Step 8:
When dividing 0 by 15, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 26820.6
Subtracting 0 from 0 leaves us 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:
15 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 26820.6
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.

In conclusion, the division gives 26820.6 with a balance of 0.0.