21648399 divided by 843 
Our goal is to divide 21648399 by 843.

On to step 1:
The number 843 fits into 2 0 times, leaving a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Take the next digit (1) from the dividend and append it to 2, then repeat: 21 / 843

Advancing to step 2:
If we divide 21 by 843, we get 0 and a remainder of 21.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 21 to get 21.
Bring next digit (6) of the dividend behind the 21 and repeat the process: 216 / 843

Step 3:
When dividing 216 by 843, we get 0 with a remainder of 216.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 216, we get 216.
Include the next digit (4) from the dividend after 216, then repeat: 2164 / 843

Going ahead to step 4:
The number 843 fits into 2164 2 times, leaving a remainder of 478.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
The remainder is 478 after subtracting 1686 from 2164.
Bring next digit (8) of the dividend behind the 478 and repeat the process: 4788 / 843

Advancing to step 5:
The number 843 fits into 4788 5 times, leaving a remainder of 573.
Put 5 as the next digit of the answer. 
Result so far: 25.0
Deduct 4215 from 4788 and we're left with 573.
Take the next digit (3) from the dividend and append it to 573, then repeat: 5733 / 843

Advancing to step 6:
843 goes into 5733 6 times with a remainder of 675.
Write down 6 as next digit of the result. 
Result so far: 256.0
Subtracting 5058 from 5733 leaves us with 675.
Fetch the next digit (9) from the dividend, attach it to 675 and continue: 6759 / 843

Step 7:
The number 843 fits into 6759 8 times, leaving a remainder of 15.
The next digit of our result is 8. 
Result so far: 2568.0
Deduct 6744 from 6759 and we're left with 15.
Append the next digit (9) from the dividend to 15 and continue with: 159 / 843

Going ahead to step 8:
843 can be fit into 159 0 times, resulting in a remainder of 159.
Record the quotient 0 as the next digit in the result. 
Result so far: 25680.0
If we take 0 away from 159, we end up with 159.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1590, and continue the process.

Advancing to step 9:
The number 843 fits into 1590 1 times, leaving a remainder of 747.
Record the quotient 1 as the next digit in the result. 
Result so far: 25680.1
Subtracting 843 from 1590 leaves us with 747.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7470, and continue the process.

Moving on to step 10:
843 goes into 7470 8 times with a remainder of 726.
The number 8 becomes the next digit in our result. 
Result so far: 25680.18
If we take 6744 away from 7470, we end up with 726.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7260, and continue the process.

Moving on to step 11:
When dividing 7260 by 843, we get 8 with a remainder of 516.
Put 8 as the next digit of the answer. 
Result so far: 25680.188
Subtracting 6744 from 7260 leaves us with 516.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5160, and continue the process.

The final outcome is 25680.188, with a leftover of 0.0516.