We're dividing 639340 by 18 
We're looking to find how many times 18 goes into 639340.

Step 1:
18 can be fit into 6 0 times, resulting in a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Grab the next digit (3) from the dividend, add it to 6, then carry on: 63 / 18

On to step 2:
18 goes into 63 3 times with a remainder of 9.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
Subtract 54 from 63 to get 9.
Append the next digit (9) from the dividend to 9 and continue with: 99 / 18

Let's proceed to step 3:
The number 18 fits into 99 5 times, leaving a remainder of 9.
Write down 5 as next digit of the result. 
Result so far: 35.0
Deduct 90 from 99 and we're left with 9.
Include the next digit (3) from the dividend after 9, then repeat: 93 / 18

Advancing to step 4:
18 goes into 93 5 times with a remainder of 3.
Write down 5 as next digit of the result. 
Result so far: 355.0
If we subtract 90 from 93, we get 3.
Fetch the next digit (4) from the dividend, attach it to 3 and continue: 34 / 18

Advancing to step 5:
18 can be fit into 34 1 times, resulting in a remainder of 16.
The number 1 becomes the next digit in our result. 
Result so far: 3551.0
Subtracting 18 from 34 leaves us with 16.
Bring next digit (0) of the dividend behind the 16 and repeat the process: 160 / 18

Moving on to step 6:
The number 18 fits into 160 8 times, leaving a remainder of 16.
The next digit of our result is 8. 
Result so far: 35518.0
The remainder is 16 after subtracting 144 from 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

On to step 7:
If we divide 160 by 18, we get 8 and a remainder of 16.
Put 8 as the next digit of the answer. 
Result so far: 35518.8
Deduct 144 from 160 and we're left with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Moving on to step 8:
160 divided by 18 is 8 with a remainder of 16.
The next digit of our result is 8. 
Result so far: 35518.88
Subtract 144 from 160 to get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Our division results in 35518.88 with a remaining 0.016.