903942 ÷ 18 
We're looking to find how many times 18 goes into 903942.

Advancing to step 1:
18 can be fit into 9 0 times, resulting in a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Grab the next digit (0) from the dividend, add it to 9, then carry on: 90 / 18

On to step 2:
The number 18 fits into 90 5 times, leaving a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
Subtracting 90 from 90 leaves us with 0.
Fetch the next digit (3) from the dividend, attach it to 0 and continue: 3 / 18

Advancing to step 3:
If we divide 3 by 18, we get 0 and a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 50.0
Deduct 0 from 3 and we're left with 3.
Include the next digit (9) from the dividend after 3, then repeat: 39 / 18

Moving on to step 4:
18 can be fit into 39 2 times, resulting in a remainder of 3.
Use 2 as the next digit of our solution. 
Result so far: 502.0
Deduct 36 from 39 and we're left with 3.
Append the next digit (4) from the dividend to 3 and continue with: 34 / 18

Going ahead to step 5:
18 can be fit into 34 1 times, resulting in a remainder of 16.
Record the quotient 1 as the next digit in the result. 
Result so far: 5021.0
Subtract 18 from 34 to get 16.
Take the next digit (2) from the dividend and append it to 16, then repeat: 162 / 18

Advancing to step 6:
18 goes into 162 9 times with a remainder of 0.
Use 9 as the next digit of our solution. 
Result so far: 50219.0
Subtract 162 from 162 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.

Moving on to step 7:
18 can be fit into 0 0 times, resulting in a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 50219.0
Subtract 0 from 0 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.

Going ahead to step 8:
18 can be fit into 0 0 times, resulting in a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 50219.0
If we subtract 0 from 0, 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.

The final outcome is 50219.0, with a leftover of 0.0.