600660 ÷ 15 
We want to divide 600660 by 15.

Let's proceed to step 1:
6 divided by 15 is 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Grab the next digit (0) from the dividend, add it to 6, then carry on: 60 / 15

Advancing to step 2:
The number 15 fits into 60 4 times, leaving a remainder of 0.
Use 4 as the next digit of our solution. 
Result so far: 4.0
Subtract 60 from 60 to get 0.
Include the next digit (0) from the dividend after 0, then repeat: 0 / 15

Let's proceed to step 3:
The number 15 fits into 0 0 times, leaving a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 40.0
Subtracting 0 from 0 leaves us with 0.
Fetch the next digit (6) from the dividend, attach it to 0 and continue: 6 / 15

Going ahead to step 4:
15 can be fit into 6 0 times, resulting in a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 400.0
Deduct 0 from 6 and we're left with 6.
Take the next digit (6) from the dividend and append it to 6, then repeat: 66 / 15

Let's proceed to step 5:
15 can be fit into 66 4 times, resulting in a remainder of 6.
The number 4 becomes the next digit in our result. 
Result so far: 4004.0
Deduct 60 from 66 and we're left with 6.
Fetch the next digit (0) from the dividend, attach it to 6 and continue: 60 / 15

Moving on to step 6:
The number 15 fits into 60 4 times, leaving a remainder of 0.
Write down 4 as next digit of the result. 
Result so far: 40044.0
Subtract 60 from 60 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.

Let's proceed to step 7:
The number 15 fits into 0 0 times, leaving a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 40044.0
Subtracting 0 from 0 leaves us 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.

Moving on to step 8:
15 goes into 0 0 times with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 40044.0
If we take 0 away from 0, we end up 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.

The final outcome is 40044.0, with a leftover of 0.0.