We're dividing 21355632 by 644 
We want to divide 21355632 by 644.

Moving on to step 1:
644 goes into 2 0 times with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 644

Going ahead to step 2:
The number 644 fits into 21 0 times, leaving a remainder of 21.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 21, we end up with 21.
Grab the next digit (3) from the dividend, add it to 21, then carry on: 213 / 644

On to step 3:
When dividing 213 by 644, we get 0 with a remainder of 213.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 213, we get 213.
Bring next digit (5) of the dividend behind the 213 and repeat the process: 2135 / 644

Moving on to step 4:
644 can be fit into 2135 3 times, resulting in a remainder of 203.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
If we subtract 1932 from 2135, we get 203.
Append the next digit (5) from the dividend to 203 and continue with: 2035 / 644

Step 5:
644 can be fit into 2035 3 times, resulting in a remainder of 103.
Put 3 as the next digit of the answer. 
Result so far: 33.0
Subtract 1932 from 2035 to get 103.
Fetch the next digit (6) from the dividend, attach it to 103 and continue: 1036 / 644

Going ahead to step 6:
644 goes into 1036 1 times with a remainder of 392.
Record the quotient 1 as the next digit in the result. 
Result so far: 331.0
Subtract 644 from 1036 to get 392.
Fetch the next digit (3) from the dividend, attach it to 392 and continue: 3923 / 644

On to step 7:
When dividing 3923 by 644, we get 6 with a remainder of 59.
The number 6 becomes the next digit in our result. 
Result so far: 3316.0
Subtracting 3864 from 3923 leaves us with 59.
Include the next digit (2) from the dividend after 59, then repeat: 592 / 644

Advancing to step 8:
When dividing 592 by 644, we get 0 with a remainder of 592.
Write down 0 as next digit of the result. 
Result so far: 33160.0
Subtracting 0 from 592 leaves us with 592.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5920, and continue the process.

Going ahead to step 9:
The number 644 fits into 5920 9 times, leaving a remainder of 124.
Write down 9 as next digit of the result. 
Result so far: 33160.9
If we take 5796 away from 5920, we end up with 124.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1240, and continue the process.

Step 10:
644 can be fit into 1240 1 times, resulting in a remainder of 596.
The number 1 becomes the next digit in our result. 
Result so far: 33160.91
If we subtract 644 from 1240, we get 596.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5960, and continue the process.

Moving on to step 11:
644 can be fit into 5960 9 times, resulting in a remainder of 164.
The next digit of our result is 9. 
Result so far: 33160.919
If we take 5796 away from 5960, we end up with 164.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1640, and continue the process.

Let's proceed to step 12:
If we divide 1640 by 644, we get 2 and a remainder of 352.
Write down 2 as next digit of the result. 
Result so far: 33160.9192
If we take 1288 away from 1640, we end up with 352.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3520, and continue the process.

Advancing to step 13:
The number 644 fits into 3520 5 times, leaving a remainder of 300.
The number 5 becomes the next digit in our result. 
Result so far: 33160.91925
If we subtract 3220 from 3520, we get 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

Advancing to step 14:
3000 divided by 644 is 4 with a remainder of 424.
Use 4 as the next digit of our solution. 
Result so far: 33160.919254
Subtracting 2576 from 3000 leaves us with 424.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4240, and continue the process.

Advancing to step 15:
644 can be fit into 4240 6 times, resulting in a remainder of 376.
Record the quotient 6 as the next digit in the result. 
Result so far: 33160.9192546
Subtract 3864 from 4240 to get 376.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3760, and continue the process.

On to step 16:
3760 divided by 644 is 5 with a remainder of 540.
Put 5 as the next digit of the answer. 
Result so far: 33160.91925465
The remainder is 540 after subtracting 3220 from 3760.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5400, and continue the process.

In conclusion, the division gives 33160.91925465 with a balance of 5.4e-07.