359987 divided by 15 
We want to divide 359987 by 15.

Advancing to step 1:
15 can be fit into 3 0 times, resulting in a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Grab the next digit (5) from the dividend, add it to 3, then carry on: 35 / 15

Step 2:
15 goes into 35 2 times with a remainder of 5.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Subtracting 30 from 35 leaves us with 5.
Fetch the next digit (9) from the dividend, attach it to 5 and continue: 59 / 15

On to step 3:
15 goes into 59 3 times with a remainder of 14.
Put 3 as the next digit of the answer. 
Result so far: 23.0
If we subtract 45 from 59, we get 14.
Append the next digit (9) from the dividend to 14 and continue with: 149 / 15

Going ahead to step 4:
15 can be fit into 149 9 times, resulting in a remainder of 14.
Record the quotient 9 as the next digit in the result. 
Result so far: 239.0
Subtracting 135 from 149 leaves us with 14.
Take the next digit (8) from the dividend and append it to 14, then repeat: 148 / 15

Step 5:
If we divide 148 by 15, we get 9 and a remainder of 13.
Put 9 as the next digit of the answer. 
Result so far: 2399.0
If we take 135 away from 148, we end up with 13.
Include the next digit (7) from the dividend after 13, then repeat: 137 / 15

Going ahead to step 6:
15 can be fit into 137 9 times, resulting in a remainder of 2.
The number 9 becomes the next digit in our result. 
Result so far: 23999.0
If we subtract 135 from 137, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 7:
15 goes into 20 1 times with a remainder of 5.
The number 1 becomes the next digit in our result. 
Result so far: 23999.1
Subtract 15 from 20 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 8:
15 goes into 50 3 times with a remainder of 5.
The next digit of our result is 3. 
Result so far: 23999.13
Subtract 45 from 50 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Going ahead to step 9:
15 goes into 50 3 times with a remainder of 5.
Put 3 as the next digit of the answer. 
Result so far: 23999.133
Deduct 45 from 50 and we're left with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

The final result is 23999.133 with a remainder of 0.0005.