We divide 644009 by 24
We want to figure out the number of times 644009 can be divided by 24.

Going ahead to step 1:
24 goes into 6 0 times with a remainder of 6.
The number 0 becomes the next digit in our 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 / 24

Moving on to step 2:
24 can be fit into 64 2 times, resulting in a remainder of 16.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
If we subtract 48 from 64, we get 16.
Append the next digit (4) from the dividend to 16 and continue with: 164 / 24

Going ahead to step 3:
24 can be fit into 164 6 times, resulting in a remainder of 20.
Use 6 as the next digit of our solution. 
Result so far: 26.0
If we subtract 144 from 164, we get 20.
Take the next digit (0) from the dividend and append it to 20, then repeat: 200 / 24

Let's proceed to step 4:
24 goes into 200 8 times with a remainder of 8.
Write down 8 as next digit of the result. 
Result so far: 268.0
If we take 192 away from 200, we end up with 8.
Bring next digit (0) of the dividend behind the 8 and repeat the process: 80 / 24

Going ahead to step 5:
The number 24 fits into 80 3 times, leaving a remainder of 8.
Record the quotient 3 as the next digit in the result. 
Result so far: 2683.0
If we subtract 72 from 80, we get 8.
Include the next digit (9) from the dividend after 8, then repeat: 89 / 24

Moving on to step 6:
The number 24 fits into 89 3 times, leaving a remainder of 17.
Put 3 as the next digit of the answer. 
Result so far: 26833.0
Deduct 72 from 89 and we're left with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Moving on to step 7:
170 divided by 24 is 7 with a remainder of 2.
Use 7 as the next digit of our solution. 
Result so far: 26833.7
If we subtract 168 from 170, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Advancing to step 8:
The number 24 fits into 20 0 times, leaving a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 26833.7
Deduct 0 from 20 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 9:
24 goes into 200 8 times with a remainder of 8.
Write down 8 as next digit of the result. 
Result so far: 26833.708
Subtracting 192 from 200 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Step 10:
The number 24 fits into 80 3 times, leaving a remainder of 8.
Write down 3 as next digit of the result. 
Result so far: 26833.7083
Subtract 72 from 80 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Step 11:
24 goes into 80 3 times with a remainder of 8.
Write down 3 as next digit of the result. 
Result so far: 26833.70833
If we take 72 away from 80, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Our division results in 26833.70833 with a remaining 8e-06.