644281 divided by 18 
Let's see how many times 18 fits into 644281.

Advancing to step 1:
When dividing 6 by 18, we get 0 with a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Grab the next digit (4) from the dividend, add it to 6, then carry on: 64 / 18

On to step 2:
The number 18 fits into 64 3 times, leaving a remainder of 10.
Put 3 as the next digit of the answer. 
Result so far: 3.0
Subtract 54 from 64 to get 10.
Take the next digit (4) from the dividend and append it to 10, then repeat: 104 / 18

Step 3:
104 divided by 18 is 5 with a remainder of 14.
Write down 5 as next digit of the result. 
Result so far: 35.0
If we take 90 away from 104, we end up with 14.
Take the next digit (2) from the dividend and append it to 14, then repeat: 142 / 18

Step 4:
18 can be fit into 142 7 times, resulting in a remainder of 16.
Put 7 as the next digit of the answer. 
Result so far: 357.0
If we subtract 126 from 142, we get 16.
Fetch the next digit (8) from the dividend, attach it to 16 and continue: 168 / 18

Moving on to step 5:
18 can be fit into 168 9 times, resulting in a remainder of 6.
Record the quotient 9 as the next digit in the result. 
Result so far: 3579.0
Deduct 162 from 168 and we're left with 6.
Bring next digit (1) of the dividend behind the 6 and repeat the process: 61 / 18

Moving on to step 6:
The number 18 fits into 61 3 times, leaving a remainder of 7.
Write down 3 as next digit of the result. 
Result so far: 35793.0
The remainder is 7 after subtracting 54 from 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Let's proceed to step 7:
70 divided by 18 is 3 with a remainder of 16.
Write down 3 as next digit of the result. 
Result so far: 35793.3
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.

Let's proceed to step 8:
160 divided by 18 is 8 with a remainder of 16.
Put 8 as the next digit of the answer. 
Result so far: 35793.38
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.

Step 9:
18 can be fit into 160 8 times, resulting in a remainder of 16.
Write down 8 as next digit of the result. 
Result so far: 35793.388
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.

Our division results in 35793.388 with a remaining 0.0016.