18599 divided by 15 
We're looking to find how many times 15 goes into 18599.

Advancing to step 1:
If we divide 1 by 15, we get 0 and a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Bring next digit (8) of the dividend behind the 1 and repeat the process: 18 / 15

On to step 2:
18 divided by 15 is 1 with a remainder of 3.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtract 15 from 18 to get 3.
Grab the next digit (5) from the dividend, add it to 3, then carry on: 35 / 15

Moving on to step 3:
The number 15 fits into 35 2 times, leaving a remainder of 5.
Use 2 as the next digit of our solution. 
Result so far: 12.0
Deduct 30 from 35 and we're left with 5.
Include the next digit (9) from the dividend after 5, then repeat: 59 / 15

Step 4:
59 divided by 15 is 3 with a remainder of 14.
Put 3 as the next digit of the answer. 
Result so far: 123.0
The remainder is 14 after subtracting 45 from 59.
Fetch the next digit (9) from the dividend, attach it to 14 and continue: 149 / 15

Going ahead to step 5:
15 goes into 149 9 times with a remainder of 14.
The number 9 becomes the next digit in our result. 
Result so far: 1239.0
Subtract 135 from 149 to get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Step 6:
If we divide 140 by 15, we get 9 and a remainder of 5.
Record the quotient 9 as the next digit in the result. 
Result so far: 1239.9
If we take 135 away from 140, we end up 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.

Step 7:
15 can be fit into 50 3 times, resulting in a remainder of 5.
Put 3 as the next digit of the answer. 
Result so far: 1239.93
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 8:
If we divide 50 by 15, we get 3 and a remainder of 5.
Put 3 as the next digit of the answer. 
Result so far: 1239.933
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.

The quotient of the division is 1239.933, and the remainder is 0.0005.