18305601 ÷ 399 
Let's see how many times 399 fits into 18305601.

Moving on to step 1:
399 goes into 1 0 times with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Fetch the next digit (8) from the dividend, attach it to 1 and continue: 18 / 399

On to step 2:
18 divided by 399 is 0 with a remainder of 18.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 18 to get 18.
Include the next digit (3) from the dividend after 18, then repeat: 183 / 399

Let's proceed to step 3:
When dividing 183 by 399, we get 0 with a remainder of 183.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 183 after subtracting 0 from 183.
Bring next digit (0) of the dividend behind the 183 and repeat the process: 1830 / 399

On to step 4:
399 can be fit into 1830 4 times, resulting in a remainder of 234.
The next digit of our result is 4. 
Result so far: 4.0
Subtract 1596 from 1830 to get 234.
Bring next digit (5) of the dividend behind the 234 and repeat the process: 2345 / 399

Moving on to step 5:
The number 399 fits into 2345 5 times, leaving a remainder of 350.
Use 5 as the next digit of our solution. 
Result so far: 45.0
Deduct 1995 from 2345 and we're left with 350.
Take the next digit (6) from the dividend and append it to 350, then repeat: 3506 / 399

On to step 6:
399 can be fit into 3506 8 times, resulting in a remainder of 314.
Use 8 as the next digit of our solution. 
Result so far: 458.0
Subtract 3192 from 3506 to get 314.
Fetch the next digit (0) from the dividend, attach it to 314 and continue: 3140 / 399

Going ahead to step 7:
3140 divided by 399 is 7 with a remainder of 347.
Write down 7 as next digit of the result. 
Result so far: 4587.0
The remainder is 347 after subtracting 2793 from 3140.
Take the next digit (1) from the dividend and append it to 347, then repeat: 3471 / 399

Going ahead to step 8:
399 goes into 3471 8 times with a remainder of 279.
Record the quotient 8 as the next digit in the result. 
Result so far: 45878.0
Subtract 3192 from 3471 to get 279.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2790, and continue the process.

Step 9:
399 can be fit into 2790 6 times, resulting in a remainder of 396.
Record the quotient 6 as the next digit in the result. 
Result so far: 45878.6
If we take 2394 away from 2790, we end up with 396.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3960, and continue the process.

Advancing to step 10:
3960 divided by 399 is 9 with a remainder of 369.
The number 9 becomes the next digit in our result. 
Result so far: 45878.69
Deduct 3591 from 3960 and we're left with 369.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3690, and continue the process.

Moving on to step 11:
399 goes into 3690 9 times with a remainder of 99.
Record the quotient 9 as the next digit in the result. 
Result so far: 45878.699
Subtract 3591 from 3690 to get 99.
Since there are no more digits in the dividend, we add a zero to the remainder making it 990, and continue the process.

The quotient of the division is 45878.699, and the remainder is 0.0099.