We look at the division of 638890 by 18 
We want to divide 638890 by 18.

Step 1:
The number 18 fits into 6 0 times, leaving a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Include the next digit (3) from the dividend after 6, then repeat: 63 / 18

Moving on to step 2:
18 can be fit into 63 3 times, resulting in a remainder of 9.
Use 3 as the next digit of our solution. 
Result so far: 3.0
Deduct 54 from 63 and we're left with 9.
Bring next digit (8) of the dividend behind the 9 and repeat the process: 98 / 18

Step 3:
18 goes into 98 5 times with a remainder of 8.
The number 5 becomes the next digit in our result. 
Result so far: 35.0
The remainder is 8 after subtracting 90 from 98.
Fetch the next digit (8) from the dividend, attach it to 8 and continue: 88 / 18

Going ahead to step 4:
If we divide 88 by 18, we get 4 and a remainder of 16.
Write down 4 as next digit of the result. 
Result so far: 354.0
The remainder is 16 after subtracting 72 from 88.
Bring next digit (9) of the dividend behind the 16 and repeat the process: 169 / 18

Advancing to step 5:
18 goes into 169 9 times with a remainder of 7.
Put 9 as the next digit of the answer. 
Result so far: 3549.0
Deduct 162 from 169 and we're left with 7.
Append the next digit (0) from the dividend to 7 and continue with: 70 / 18

Going ahead to step 6:
If we divide 70 by 18, we get 3 and a remainder of 16.
Use 3 as the next digit of our solution. 
Result so far: 35493.0
If we take 54 away from 70, we end up 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 7:
18 can be fit into 160 8 times, resulting in a remainder of 16.
Put 8 as the next digit of the answer. 
Result so far: 35493.8
If we subtract 144 from 160, we 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.

On to step 8:
The number 18 fits into 160 8 times, leaving a remainder of 16.
Put 8 as the next digit of the answer. 
Result so far: 35493.88
If we take 144 away from 160, we end up 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.

The final result is 35493.88 with a remainder of 0.016.