21989929 ÷ 813 
We're looking to find how many times 813 goes into 21989929.

Advancing to step 1:
When dividing 2 by 813, we get 0 with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 813

Advancing to step 2:
21 divided by 813 is 0 with a remainder of 21.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 21, we get 21.
Fetch the next digit (9) from the dividend, attach it to 21 and continue: 219 / 813

Moving on to step 3:
813 can be fit into 219 0 times, resulting in a remainder of 219.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 219 to get 219.
Include the next digit (8) from the dividend after 219, then repeat: 2198 / 813

Going ahead to step 4:
2198 divided by 813 is 2 with a remainder of 572.
Put 2 as the next digit of the answer. 
Result so far: 2.0
The remainder is 572 after subtracting 1626 from 2198.
Take the next digit (9) from the dividend and append it to 572, then repeat: 5729 / 813

On to step 5:
5729 divided by 813 is 7 with a remainder of 38.
The number 7 becomes the next digit in our result. 
Result so far: 27.0
Subtracting 5691 from 5729 leaves us with 38.
Grab the next digit (9) from the dividend, add it to 38, then carry on: 389 / 813

Moving on to step 6:
The number 813 fits into 389 0 times, leaving a remainder of 389.
Put 0 as the next digit of the answer. 
Result so far: 270.0
The remainder is 389 after subtracting 0 from 389.
Take the next digit (2) from the dividend and append it to 389, then repeat: 3892 / 813

On to step 7:
The number 813 fits into 3892 4 times, leaving a remainder of 640.
Put 4 as the next digit of the answer. 
Result so far: 2704.0
Subtracting 3252 from 3892 leaves us with 640.
Bring next digit (9) of the dividend behind the 640 and repeat the process: 6409 / 813

Moving on to step 8:
The number 813 fits into 6409 7 times, leaving a remainder of 718.
Put 7 as the next digit of the answer. 
Result so far: 27047.0
If we subtract 5691 from 6409, we get 718.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7180, and continue the process.

Step 9:
The number 813 fits into 7180 8 times, leaving a remainder of 676.
The next digit of our result is 8. 
Result so far: 27047.8
Subtracting 6504 from 7180 leaves us with 676.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6760, and continue the process.

On to step 10:
When dividing 6760 by 813, we get 8 with a remainder of 256.
The next digit of our result is 8. 
Result so far: 27047.88
Subtracting 6504 from 6760 leaves us with 256.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2560, and continue the process.

After the division, we end up with 27047.88 and a remainder of 0.256.