423649 divided by 18 
Our goal is to divide 423649 by 18.

Step 1:
4 divided by 18 is 0 with a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Fetch the next digit (2) from the dividend, attach it to 4 and continue: 42 / 18

Advancing to step 2:
The number 18 fits into 42 2 times, leaving a remainder of 6.
The next digit of our result is 2. 
Result so far: 2.0
Subtract 36 from 42 to get 6.
Append the next digit (3) from the dividend to 6 and continue with: 63 / 18

Let's proceed to step 3:
If we divide 63 by 18, we get 3 and a remainder of 9.
The next digit of our result is 3. 
Result so far: 23.0
The remainder is 9 after subtracting 54 from 63.
Fetch the next digit (6) from the dividend, attach it to 9 and continue: 96 / 18

On to step 4:
18 can be fit into 96 5 times, resulting in a remainder of 6.
The number 5 becomes the next digit in our result. 
Result so far: 235.0
Subtract 90 from 96 to get 6.
Grab the next digit (4) from the dividend, add it to 6, then carry on: 64 / 18

Advancing to step 5:
18 goes into 64 3 times with a remainder of 10.
Use 3 as the next digit of our solution. 
Result so far: 2353.0
Deduct 54 from 64 and we're left with 10.
Bring next digit (9) of the dividend behind the 10 and repeat the process: 109 / 18

Step 6:
109 divided by 18 is 6 with a remainder of 1.
The number 6 becomes the next digit in our result. 
Result so far: 23536.0
Deduct 108 from 109 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Moving on to step 7:
If we divide 10 by 18, we get 0 and a remainder of 10.
Write down 0 as next digit of the result. 
Result so far: 23536.0
Subtract 0 from 10 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 8:
The number 18 fits into 100 5 times, leaving a remainder of 10.
The number 5 becomes the next digit in our result. 
Result so far: 23536.05
If we take 90 away from 100, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 9:
18 goes into 100 5 times with a remainder of 10.
Write down 5 as next digit of the result. 
Result so far: 23536.055
Deduct 90 from 100 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The final outcome is 23536.055, with a leftover of 0.001.