We're dividing 644958 by 18 
We want to divide 644958 by 18.

Going ahead to step 1:
18 goes into 6 0 times with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Include the next digit (4) from the dividend after 6, then repeat: 64 / 18

Step 2:
If we divide 64 by 18, we get 3 and a remainder of 10.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
Deduct 54 from 64 and we're left with 10.
Fetch the next digit (4) from the dividend, attach it to 10 and continue: 104 / 18

Let's proceed to step 3:
The number 18 fits into 104 5 times, leaving a remainder of 14.
The number 5 becomes the next digit in our result. 
Result so far: 35.0
Subtract 90 from 104 to get 14.
Append the next digit (9) from the dividend to 14 and continue with: 149 / 18

On to step 4:
18 goes into 149 8 times with a remainder of 5.
Write down 8 as next digit of the result. 
Result so far: 358.0
If we take 144 away from 149, we end up with 5.
Bring next digit (5) of the dividend behind the 5 and repeat the process: 55 / 18

On to step 5:
The number 18 fits into 55 3 times, leaving a remainder of 1.
Record the quotient 3 as the next digit in the result. 
Result so far: 3583.0
Subtracting 54 from 55 leaves us with 1.
Take the next digit (8) from the dividend and append it to 1, then repeat: 18 / 18

Advancing to step 6:
When dividing 18 by 18, we get 1 with a remainder of 0.
Write down 1 as next digit of the result. 
Result so far: 35831.0
If we subtract 18 from 18, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 7:
The number 18 fits into 0 0 times, leaving a remainder of 0.
The next digit of our result is 0. 
Result so far: 35831.0
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 8:
If we divide 0 by 18, we get 0 and a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 35831.0
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 35831.0 and a remainder of 0.0.