We look at the division of 423155 by 18 
Let's see how many times 18 fits into 423155.

Going ahead to step 1:
18 goes into 4 0 times with a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Grab the next digit (2) from the dividend, add it to 4, then carry on: 42 / 18

Step 2:
18 can be fit into 42 2 times, resulting in a remainder of 6.
The next digit of our result is 2. 
Result so far: 2.0
If we take 36 away from 42, we end up with 6.
Bring next digit (3) of the dividend behind the 6 and repeat the process: 63 / 18

Advancing to step 3:
The number 18 fits into 63 3 times, leaving a remainder of 9.
Put 3 as the next digit of the answer. 
Result so far: 23.0
If we subtract 54 from 63, we get 9.
Take the next digit (1) from the dividend and append it to 9, then repeat: 91 / 18

Step 4:
91 divided by 18 is 5 with a remainder of 1.
Record the quotient 5 as the next digit in the result. 
Result so far: 235.0
Deduct 90 from 91 and we're left with 1.
Include the next digit (5) from the dividend after 1, then repeat: 15 / 18

Step 5:
If we divide 15 by 18, we get 0 and a remainder of 15.
Put 0 as the next digit of the answer. 
Result so far: 2350.0
Subtract 0 from 15 to get 15.
Grab the next digit (5) from the dividend, add it to 15, then carry on: 155 / 18

Going ahead to step 6:
The number 18 fits into 155 8 times, leaving a remainder of 11.
Write down 8 as next digit of the result. 
Result so far: 23508.0
If we subtract 144 from 155, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Going ahead to step 7:
18 can be fit into 110 6 times, resulting in a remainder of 2.
Record the quotient 6 as the next digit in the result. 
Result so far: 23508.6
If we subtract 108 from 110, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Advancing to step 8:
The number 18 fits into 20 1 times, leaving a remainder of 2.
Write down 1 as next digit of the result. 
Result so far: 23508.61
Deduct 18 from 20 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 9:
When dividing 20 by 18, we get 1 with a remainder of 2.
Record the quotient 1 as the next digit in the result. 
Result so far: 23508.611
If we take 18 away from 20, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Our division results in 23508.611 with a remaining 0.0002.