We're dividing 485815 by 15 
We want to figure out the number of times 485815 can be divided by 15.

On to step 1:
The number 15 fits into 4 0 times, leaving a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 4, we get 4.
Include the next digit (8) from the dividend after 4, then repeat: 48 / 15

Advancing to step 2:
15 can be fit into 48 3 times, resulting in a remainder of 3.
The next digit of our result is 3. 
Result so far: 3.0
Deduct 45 from 48 and we're left with 3.
Append the next digit (5) from the dividend to 3 and continue with: 35 / 15

Advancing to step 3:
The number 15 fits into 35 2 times, leaving a remainder of 5.
Write down 2 as next digit of the result. 
Result so far: 32.0
If we take 30 away from 35, we end up with 5.
Grab the next digit (8) from the dividend, add it to 5, then carry on: 58 / 15

Moving on to step 4:
The number 15 fits into 58 3 times, leaving a remainder of 13.
Write down 3 as next digit of the result. 
Result so far: 323.0
If we take 45 away from 58, we end up with 13.
Fetch the next digit (1) from the dividend, attach it to 13 and continue: 131 / 15

Step 5:
131 divided by 15 is 8 with a remainder of 11.
Put 8 as the next digit of the answer. 
Result so far: 3238.0
The remainder is 11 after subtracting 120 from 131.
Bring next digit (5) of the dividend behind the 11 and repeat the process: 115 / 15

Let's proceed to step 6:
15 goes into 115 7 times with a remainder of 10.
Put 7 as the next digit of the answer. 
Result so far: 32387.0
Subtracting 105 from 115 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 7:
15 goes into 100 6 times with a remainder of 10.
Put 6 as the next digit of the answer. 
Result so far: 32387.6
The remainder is 10 after subtracting 90 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 8:
15 can be fit into 100 6 times, resulting in a remainder of 10.
Write down 6 as next digit of the result. 
Result so far: 32387.66
The remainder is 10 after subtracting 90 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The final outcome is 32387.66, with a leftover of 0.01.