We divide 18633861 by 644
We want to divide 18633861 by 644.

Going ahead to step 1:
If we divide 1 by 644, we get 0 and a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Fetch the next digit (8) from the dividend, attach it to 1 and continue: 18 / 644

Going ahead to step 2:
644 goes into 18 0 times with a remainder of 18.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 18, we get 18.
Take the next digit (6) from the dividend and append it to 18, then repeat: 186 / 644

Let's proceed to step 3:
The number 644 fits into 186 0 times, leaving a remainder of 186.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 186 after subtracting 0 from 186.
Append the next digit (3) from the dividend to 186 and continue with: 1863 / 644

Advancing to step 4:
644 goes into 1863 2 times with a remainder of 575.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Subtract 1288 from 1863 to get 575.
Append the next digit (3) from the dividend to 575 and continue with: 5753 / 644

On to step 5:
5753 divided by 644 is 8 with a remainder of 601.
The next digit of our result is 8. 
Result so far: 28.0
If we take 5152 away from 5753, we end up with 601.
Fetch the next digit (8) from the dividend, attach it to 601 and continue: 6018 / 644

Let's proceed to step 6:
When dividing 6018 by 644, we get 9 with a remainder of 222.
The number 9 becomes the next digit in our result. 
Result so far: 289.0
Subtract 5796 from 6018 to get 222.
Bring next digit (6) of the dividend behind the 222 and repeat the process: 2226 / 644

Moving on to step 7:
644 goes into 2226 3 times with a remainder of 294.
Record the quotient 3 as the next digit in the result. 
Result so far: 2893.0
The remainder is 294 after subtracting 1932 from 2226.
Append the next digit (1) from the dividend to 294 and continue with: 2941 / 644

Going ahead to step 8:
644 can be fit into 2941 4 times, resulting in a remainder of 365.
Use 4 as the next digit of our solution. 
Result so far: 28934.0
If we subtract 2576 from 2941, we get 365.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3650, and continue the process.

Moving on to step 9:
The number 644 fits into 3650 5 times, leaving a remainder of 430.
Use 5 as the next digit of our solution. 
Result so far: 28934.5
Subtracting 3220 from 3650 leaves us with 430.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4300, and continue the process.

Going ahead to step 10:
4300 divided by 644 is 6 with a remainder of 436.
The number 6 becomes the next digit in our result. 
Result so far: 28934.56
If we take 3864 away from 4300, we end up with 436.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4360, and continue the process.

Advancing to step 11:
When dividing 4360 by 644, we get 6 with a remainder of 496.
The number 6 becomes the next digit in our result. 
Result so far: 28934.566
Subtracting 3864 from 4360 leaves us with 496.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4960, and continue the process.

After the division, we end up with 28934.566 and a remainder of 0.0496.