We're dividing 255390 by 18 
We want to figure out the number of times 255390 can be divided by 18.

Let's proceed to step 1:
2 divided by 18 is 0 with a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Grab the next digit (5) from the dividend, add it to 2, then carry on: 25 / 18

Moving on to step 2:
The number 18 fits into 25 1 times, leaving a remainder of 7.
The next digit of our result is 1. 
Result so far: 1.0
Subtract 18 from 25 to get 7.
Bring next digit (5) of the dividend behind the 7 and repeat the process: 75 / 18

Advancing to step 3:
18 can be fit into 75 4 times, resulting in a remainder of 3.
Write down 4 as next digit of the result. 
Result so far: 14.0
If we take 72 away from 75, we end up with 3.
Append the next digit (3) from the dividend to 3 and continue with: 33 / 18

On to step 4:
18 goes into 33 1 times with a remainder of 15.
The number 1 becomes the next digit in our result. 
Result so far: 141.0
If we take 18 away from 33, we end up with 15.
Append the next digit (9) from the dividend to 15 and continue with: 159 / 18

On to step 5:
The number 18 fits into 159 8 times, leaving a remainder of 15.
The number 8 becomes the next digit in our result. 
Result so far: 1418.0
Subtract 144 from 159 to get 15.
Fetch the next digit (0) from the dividend, attach it to 15 and continue: 150 / 18

Step 6:
18 goes into 150 8 times with a remainder of 6.
Write down 8 as next digit of the result. 
Result so far: 14188.0
The remainder is 6 after subtracting 144 from 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 7:
The number 18 fits into 60 3 times, leaving a remainder of 6.
Put 3 as the next digit of the answer. 
Result so far: 14188.3
Subtract 54 from 60 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 8:
18 goes into 60 3 times with a remainder of 6.
Put 3 as the next digit of the answer. 
Result so far: 14188.33
Subtracting 54 from 60 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

The final result is 14188.33 with a remainder of 0.006.