We look at the division of 171285 by 15 
We want to figure out the number of times 171285 can be divided by 15.

On to step 1:
If we divide 1 by 15, we get 0 and a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Append the next digit (7) from the dividend to 1 and continue with: 17 / 15

Going ahead to step 2:
15 goes into 17 1 times with a remainder of 2.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtracting 15 from 17 leaves us with 2.
Take the next digit (1) from the dividend and append it to 2, then repeat: 21 / 15

Advancing to step 3:
21 divided by 15 is 1 with a remainder of 6.
The next digit of our result is 1. 
Result so far: 11.0
Subtracting 15 from 21 leaves us with 6.
Fetch the next digit (2) from the dividend, attach it to 6 and continue: 62 / 15

Step 4:
When dividing 62 by 15, we get 4 with a remainder of 2.
Use 4 as the next digit of our solution. 
Result so far: 114.0
Deduct 60 from 62 and we're left with 2.
Grab the next digit (8) from the dividend, add it to 2, then carry on: 28 / 15

Let's proceed to step 5:
When dividing 28 by 15, we get 1 with a remainder of 13.
The next digit of our result is 1. 
Result so far: 1141.0
The remainder is 13 after subtracting 15 from 28.
Bring next digit (5) of the dividend behind the 13 and repeat the process: 135 / 15

Step 6:
15 can be fit into 135 9 times, resulting in a remainder of 0.
Use 9 as the next digit of our solution. 
Result so far: 11419.0
If we subtract 135 from 135, 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.

On to step 7:
The number 15 fits into 0 0 times, leaving a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 11419.0
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.

Going ahead to step 8:
0 divided by 15 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 11419.0
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 11419.0, and the remainder is 0.0.