408558 ÷ 18 
We want to divide 408558 by 18.

Step 1:
The number 18 fits into 4 0 times, leaving a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Bring next digit (0) of the dividend behind the 4 and repeat the process: 40 / 18

Going ahead to step 2:
40 divided by 18 is 2 with a remainder of 4.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Deduct 36 from 40 and we're left with 4.
Take the next digit (8) from the dividend and append it to 4, then repeat: 48 / 18

On to step 3:
48 divided by 18 is 2 with a remainder of 12.
Write down 2 as next digit of the result. 
Result so far: 22.0
If we subtract 36 from 48, we get 12.
Fetch the next digit (5) from the dividend, attach it to 12 and continue: 125 / 18

On to step 4:
18 goes into 125 6 times with a remainder of 17.
The number 6 becomes the next digit in our result. 
Result so far: 226.0
Deduct 108 from 125 and we're left with 17.
Bring next digit (5) of the dividend behind the 17 and repeat the process: 175 / 18

Going ahead to step 5:
18 goes into 175 9 times with a remainder of 13.
The number 9 becomes the next digit in our result. 
Result so far: 2269.0
Subtracting 162 from 175 leaves us with 13.
Grab the next digit (8) from the dividend, add it to 13, then carry on: 138 / 18

Going ahead to step 6:
138 divided by 18 is 7 with a remainder of 12.
Record the quotient 7 as the next digit in the result. 
Result so far: 22697.0
Subtracting 126 from 138 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Moving on to step 7:
The number 18 fits into 120 6 times, leaving a remainder of 12.
Put 6 as the next digit of the answer. 
Result so far: 22697.6
Deduct 108 from 120 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Moving on to step 8:
The number 18 fits into 120 6 times, leaving a remainder of 12.
The next digit of our result is 6. 
Result so far: 22697.66
The remainder is 12 after subtracting 108 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

The quotient of the division is 22697.66, and the remainder is 0.012.