We look at the division of 255864 by 15 
We want to divide 255864 by 15.

Step 1:
The number 15 fits into 2 0 times, leaving a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Grab the next digit (5) from the dividend, add it to 2, then carry on: 25 / 15

Let's proceed to step 2:
If we divide 25 by 15, we get 1 and a remainder of 10.
The next digit of our result is 1. 
Result so far: 1.0
If we take 15 away from 25, we end up with 10.
Fetch the next digit (5) from the dividend, attach it to 10 and continue: 105 / 15

On to step 3:
The number 15 fits into 105 7 times, leaving a remainder of 0.
Use 7 as the next digit of our solution. 
Result so far: 17.0
Deduct 105 from 105 and we're left with 0.
Include the next digit (8) from the dividend after 0, then repeat: 8 / 15

Let's proceed to step 4:
15 can be fit into 8 0 times, resulting in a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 170.0
Deduct 0 from 8 and we're left with 8.
Grab the next digit (6) from the dividend, add it to 8, then carry on: 86 / 15

Going ahead to step 5:
When dividing 86 by 15, we get 5 with a remainder of 11.
Put 5 as the next digit of the answer. 
Result so far: 1705.0
Subtracting 75 from 86 leaves us with 11.
Bring next digit (4) of the dividend behind the 11 and repeat the process: 114 / 15

Moving on to step 6:
15 can be fit into 114 7 times, resulting in a remainder of 9.
Use 7 as the next digit of our solution. 
Result so far: 17057.0
If we subtract 105 from 114, we get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Step 7:
The number 15 fits into 90 6 times, leaving a remainder of 0.
The number 6 becomes the next digit in our result. 
Result so far: 17057.6
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.

Going ahead to step 8:
15 goes into 0 0 times with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 17057.6
Deduct 0 from 0 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 9:
15 goes into 0 0 times with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 17057.6
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.

The quotient of the division is 17057.6, and the remainder is 0.0.