21956810 divided by 644 
Our goal is to divide 21956810 by 644.

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
Deduct 0 from 2 and we're left with 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 644

Advancing to step 2:
When dividing 21 by 644, we get 0 with a remainder of 21.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 21 after subtracting 0 from 21.
Grab the next digit (9) from the dividend, add it to 21, then carry on: 219 / 644

Moving on to step 3:
644 can be fit into 219 0 times, resulting in a remainder of 219.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 219 and we're left with 219.
Grab the next digit (5) from the dividend, add it to 219, then carry on: 2195 / 644

Moving on to step 4:
644 goes into 2195 3 times with a remainder of 263.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
Subtract 1932 from 2195 to get 263.
Take the next digit (6) from the dividend and append it to 263, then repeat: 2636 / 644

Going ahead to step 5:
If we divide 2636 by 644, we get 4 and a remainder of 60.
Use 4 as the next digit of our solution. 
Result so far: 34.0
If we subtract 2576 from 2636, we get 60.
Bring next digit (8) of the dividend behind the 60 and repeat the process: 608 / 644

Going ahead to step 6:
If we divide 608 by 644, we get 0 and a remainder of 608.
The next digit of our result is 0. 
Result so far: 340.0
Subtract 0 from 608 to get 608.
Include the next digit (1) from the dividend after 608, then repeat: 6081 / 644

On to step 7:
644 goes into 6081 9 times with a remainder of 285.
Write down 9 as next digit of the result. 
Result so far: 3409.0
Subtract 5796 from 6081 to get 285.
Grab the next digit (0) from the dividend, add it to 285, then carry on: 2850 / 644

Advancing to step 8:
The number 644 fits into 2850 4 times, leaving a remainder of 274.
Record the quotient 4 as the next digit in the result. 
Result so far: 34094.0
If we subtract 2576 from 2850, we get 274.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2740, and continue the process.

Moving on to step 9:
644 can be fit into 2740 4 times, resulting in a remainder of 164.
Write down 4 as next digit of the result. 
Result so far: 34094.4
Deduct 2576 from 2740 and we're left 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.

On to step 10:
644 goes into 1640 2 times with a remainder of 352.
Record the quotient 2 as the next digit in the result. 
Result so far: 34094.42
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 11:
3520 divided by 644 is 5 with a remainder of 300.
Write down 5 as next digit of the result. 
Result so far: 34094.425
If we take 3220 away from 3520, we end up with 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

Moving on to step 12:
When dividing 3000 by 644, we get 4 with a remainder of 424.
Put 4 as the next digit of the answer. 
Result so far: 34094.4254
If we subtract 2576 from 3000, we get 424.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4240, and continue the process.

Step 13:
4240 divided by 644 is 6 with a remainder of 376.
Use 6 as the next digit of our solution. 
Result so far: 34094.42546
If we take 3864 away from 4240, we end up with 376.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3760, and continue the process.

Going ahead to step 14:
When dividing 3760 by 644, we get 5 with a remainder of 540.
The next digit of our result is 5. 
Result so far: 34094.425465
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.

Moving on to step 15:
5400 divided by 644 is 8 with a remainder of 248.
Record the quotient 8 as the next digit in the result. 
Result so far: 34094.4254658
The remainder is 248 after subtracting 5152 from 5400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2480, and continue the process.

Step 16:
644 can be fit into 2480 3 times, resulting in a remainder of 548.
The number 3 becomes the next digit in our result. 
Result so far: 34094.42546583
Subtracting 1932 from 2480 leaves us with 548.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5480, and continue the process.

The quotient of the division is 34094.42546583, and the remainder is 5.48e-07.