18356503 ÷ 999 
We want to divide 18356503 by 999.

Let's proceed to step 1:
1 divided by 999 is 0 with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Bring next digit (8) of the dividend behind the 1 and repeat the process: 18 / 999

On to step 2:
18 divided by 999 is 0 with a remainder of 18.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 18, we get 18.
Take the next digit (3) from the dividend and append it to 18, then repeat: 183 / 999

Let's proceed to step 3:
The number 999 fits into 183 0 times, leaving a remainder of 183.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 183 and we're left with 183.
Include the next digit (5) from the dividend after 183, then repeat: 1835 / 999

Moving on to step 4:
999 can be fit into 1835 1 times, resulting in a remainder of 836.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtracting 999 from 1835 leaves us with 836.
Fetch the next digit (6) from the dividend, attach it to 836 and continue: 8366 / 999

Advancing to step 5:
999 goes into 8366 8 times with a remainder of 374.
Put 8 as the next digit of the answer. 
Result so far: 18.0
If we take 7992 away from 8366, we end up with 374.
Grab the next digit (5) from the dividend, add it to 374, then carry on: 3745 / 999

Let's proceed to step 6:
If we divide 3745 by 999, we get 3 and a remainder of 748.
The next digit of our result is 3. 
Result so far: 183.0
If we take 2997 away from 3745, we end up with 748.
Bring next digit (0) of the dividend behind the 748 and repeat the process: 7480 / 999

Moving on to step 7:
If we divide 7480 by 999, we get 7 and a remainder of 487.
Write down 7 as next digit of the result. 
Result so far: 1837.0
Subtract 6993 from 7480 to get 487.
Append the next digit (3) from the dividend to 487 and continue with: 4873 / 999

On to step 8:
999 can be fit into 4873 4 times, resulting in a remainder of 877.
Put 4 as the next digit of the answer. 
Result so far: 18374.0
Subtracting 3996 from 4873 leaves us with 877.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8770, and continue the process.

Advancing to step 9:
The number 999 fits into 8770 8 times, leaving a remainder of 778.
Record the quotient 8 as the next digit in the result. 
Result so far: 18374.8
If we subtract 7992 from 8770, we get 778.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7780, and continue the process.

Moving on to step 10:
If we divide 7780 by 999, we get 7 and a remainder of 787.
Write down 7 as next digit of the result. 
Result so far: 18374.87
Deduct 6993 from 7780 and we're left with 787.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7870, and continue the process.

On to step 11:
When dividing 7870 by 999, we get 7 with a remainder of 877.
The next digit of our result is 7. 
Result so far: 18374.877
If we take 6993 away from 7870, we end up with 877.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8770, and continue the process.

In conclusion, the division gives 18374.877 with a balance of 0.0877.