12459 divided by 15 
We want to divide 12459 by 15.

Let's proceed to step 1:
15 goes into 1 0 times with a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Bring next digit (2) of the dividend behind the 1 and repeat the process: 12 / 15

Let's proceed to step 2:
15 can be fit into 12 0 times, resulting in a remainder of 12.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 12 to get 12.
Include the next digit (4) from the dividend after 12, then repeat: 124 / 15

Moving on to step 3:
15 can be fit into 124 8 times, resulting in a remainder of 4.
Use 8 as the next digit of our solution. 
Result so far: 8.0
The remainder is 4 after subtracting 120 from 124.
Include the next digit (5) from the dividend after 4, then repeat: 45 / 15

Step 4:
The number 15 fits into 45 3 times, leaving a remainder of 0.
Put 3 as the next digit of the answer. 
Result so far: 83.0
Subtracting 45 from 45 leaves us with 0.
Grab the next digit (9) from the dividend, add it to 0, then carry on: 9 / 15

Step 5:
If we divide 9 by 15, we get 0 and a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 830.0
Subtracting 0 from 9 leaves us 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.

Let's proceed to step 6:
When dividing 90 by 15, we get 6 with a remainder of 0.
Put 6 as the next digit of the answer. 
Result so far: 830.6
Deduct 90 from 90 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.

Going ahead to step 7:
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: 830.6
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.

Let's proceed to step 8:
The number 15 fits into 0 0 times, leaving a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 830.6
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.

The quotient of the division is 830.6, and the remainder is 0.0.