33390985 divided by 644 
Let's see how many times 644 fits into 33390985.

Going ahead to step 1:
3 divided by 644 is 0 with a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Include the next digit (3) from the dividend after 3, then repeat: 33 / 644

Going ahead to step 2:
If we divide 33 by 644, we get 0 and a remainder of 33.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 33, we get 33.
Append the next digit (3) from the dividend to 33 and continue with: 333 / 644

Let's proceed to step 3:
644 goes into 333 0 times with a remainder of 333.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 333 and we're left with 333.
Grab the next digit (9) from the dividend, add it to 333, then carry on: 3339 / 644

On to step 4:
The number 644 fits into 3339 5 times, leaving a remainder of 119.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
The remainder is 119 after subtracting 3220 from 3339.
Append the next digit (0) from the dividend to 119 and continue with: 1190 / 644

Step 5:
1190 divided by 644 is 1 with a remainder of 546.
Put 1 as the next digit of the answer. 
Result so far: 51.0
If we take 644 away from 1190, we end up with 546.
Append the next digit (9) from the dividend to 546 and continue with: 5469 / 644

Step 6:
5469 divided by 644 is 8 with a remainder of 317.
Write down 8 as next digit of the result. 
Result so far: 518.0
Deduct 5152 from 5469 and we're left with 317.
Fetch the next digit (8) from the dividend, attach it to 317 and continue: 3178 / 644

Let's proceed to step 7:
644 can be fit into 3178 4 times, resulting in a remainder of 602.
Record the quotient 4 as the next digit in the result. 
Result so far: 5184.0
Subtract 2576 from 3178 to get 602.
Bring next digit (5) of the dividend behind the 602 and repeat the process: 6025 / 644

Advancing to step 8:
The number 644 fits into 6025 9 times, leaving a remainder of 229.
Use 9 as the next digit of our solution. 
Result so far: 51849.0
Deduct 5796 from 6025 and we're left with 229.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2290, and continue the process.

Going ahead to step 9:
If we divide 2290 by 644, we get 3 and a remainder of 358.
The next digit of our result is 3. 
Result so far: 51849.3
If we take 1932 away from 2290, we end up with 358.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3580, and continue the process.

Step 10:
If we divide 3580 by 644, we get 5 and a remainder of 360.
Use 5 as the next digit of our solution. 
Result so far: 51849.35
Subtract 3220 from 3580 to get 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

Going ahead to step 11:
3600 divided by 644 is 5 with a remainder of 380.
Use 5 as the next digit of our solution. 
Result so far: 51849.355
If we subtract 3220 from 3600, we get 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3800, and continue the process.

The final result is 51849.355 with a remainder of 0.038.