Let's divide 25117409 by 644
We want to divide 25117409 by 644.

On to step 1:
644 can be fit into 2 0 times, resulting in a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Append the next digit (5) from the dividend to 2 and continue with: 25 / 644

Moving on to step 2:
644 goes into 25 0 times with a remainder of 25.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 25, we get 25.
Grab the next digit (1) from the dividend, add it to 25, then carry on: 251 / 644

Let's proceed to step 3:
The number 644 fits into 251 0 times, leaving a remainder of 251.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 251, we end up with 251.
Append the next digit (1) from the dividend to 251 and continue with: 2511 / 644

Let's proceed to step 4:
The number 644 fits into 2511 3 times, leaving a remainder of 579.
Write down 3 as next digit of the result. 
Result so far: 3.0
If we take 1932 away from 2511, we end up with 579.
Take the next digit (7) from the dividend and append it to 579, then repeat: 5797 / 644

Going ahead to step 5:
If we divide 5797 by 644, we get 9 and a remainder of 1.
The next digit of our result is 9. 
Result so far: 39.0
Subtract 5796 from 5797 to get 1.
Fetch the next digit (4) from the dividend, attach it to 1 and continue: 14 / 644

Going ahead to step 6:
The number 644 fits into 14 0 times, leaving a remainder of 14.
Use 0 as the next digit of our solution. 
Result so far: 390.0
Subtracting 0 from 14 leaves us with 14.
Fetch the next digit (0) from the dividend, attach it to 14 and continue: 140 / 644

Step 7:
140 divided by 644 is 0 with a remainder of 140.
Record the quotient 0 as the next digit in the result. 
Result so far: 3900.0
Subtract 0 from 140 to get 140.
Bring next digit (9) of the dividend behind the 140 and repeat the process: 1409 / 644

Step 8:
The number 644 fits into 1409 2 times, leaving a remainder of 121.
Put 2 as the next digit of the answer. 
Result so far: 39002.0
Subtract 1288 from 1409 to get 121.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1210, and continue the process.

Going ahead to step 9:
The number 644 fits into 1210 1 times, leaving a remainder of 566.
Record the quotient 1 as the next digit in the result. 
Result so far: 39002.1
Subtracting 644 from 1210 leaves us with 566.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5660, and continue the process.

On to step 10:
The number 644 fits into 5660 8 times, leaving a remainder of 508.
The number 8 becomes the next digit in our result. 
Result so far: 39002.18
Subtract 5152 from 5660 to get 508.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5080, and continue the process.

Moving on to step 11:
When dividing 5080 by 644, we get 7 with a remainder of 572.
Use 7 as the next digit of our solution. 
Result so far: 39002.187
Deduct 4508 from 5080 and we're left with 572.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5720, and continue the process.

Let's proceed to step 12:
When dividing 5720 by 644, we get 8 with a remainder of 568.
The next digit of our result is 8. 
Result so far: 39002.1878
If we take 5152 away from 5720, we end up with 568.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5680, and continue the process.

Advancing to step 13:
644 can be fit into 5680 8 times, resulting in a remainder of 528.
Put 8 as the next digit of the answer. 
Result so far: 39002.18788
The remainder is 528 after subtracting 5152 from 5680.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5280, and continue the process.

The final outcome is 39002.18788, with a leftover of 0.000528.