603660 ÷ 40 
We want to divide 603660 by 40.

Let's proceed to step 1:
The number 40 fits into 6 0 times, leaving a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Include the next digit (0) from the dividend after 6, then repeat: 60 / 40

On to step 2:
If we divide 60 by 40, we get 1 and a remainder of 20.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we take 40 away from 60, we end up with 20.
Take the next digit (3) from the dividend and append it to 20, then repeat: 203 / 40

On to step 3:
203 divided by 40 is 5 with a remainder of 3.
Record the quotient 5 as the next digit in the result. 
Result so far: 15.0
Subtract 200 from 203 to get 3.
Take the next digit (6) from the dividend and append it to 3, then repeat: 36 / 40

Let's proceed to step 4:
36 divided by 40 is 0 with a remainder of 36.
Put 0 as the next digit of the answer. 
Result so far: 150.0
If we subtract 0 from 36, we get 36.
Include the next digit (6) from the dividend after 36, then repeat: 366 / 40

On to step 5:
When dividing 366 by 40, we get 9 with a remainder of 6.
Use 9 as the next digit of our solution. 
Result so far: 1509.0
Deduct 360 from 366 and we're left with 6.
Take the next digit (0) from the dividend and append it to 6, then repeat: 60 / 40

Advancing to step 6:
40 goes into 60 1 times with a remainder of 20.
Write down 1 as next digit of the result. 
Result so far: 15091.0
Subtract 40 from 60 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 7:
40 can be fit into 200 5 times, resulting in a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 15091.5
If we subtract 200 from 200, 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.

Going ahead to step 8:
When dividing 0 by 40, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 15091.5
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.

Moving on to step 9:
When dividing 0 by 40, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 15091.5
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.

In conclusion, the division gives 15091.5 with a balance of 0.0.