Let's divide 21038 by 81
We want to figure out the number of times 21038 can be divided by 81.

Step 1:
81 can be fit into 2 0 times, resulting in a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Take the next digit (1) from the dividend and append it to 2, then repeat: 21 / 81

Going ahead to step 2:
When dividing 21 by 81, we get 0 with a remainder of 21.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 21 leaves us with 21.
Append the next digit (0) from the dividend to 21 and continue with: 210 / 81

Let's proceed to step 3:
81 can be fit into 210 2 times, resulting in a remainder of 48.
The next digit of our result is 2. 
Result so far: 2.0
If we subtract 162 from 210, we get 48.
Bring next digit (3) of the dividend behind the 48 and repeat the process: 483 / 81

On to step 4:
483 divided by 81 is 5 with a remainder of 78.
Write down 5 as next digit of the result. 
Result so far: 25.0
Deduct 405 from 483 and we're left with 78.
Fetch the next digit (8) from the dividend, attach it to 78 and continue: 788 / 81

Going ahead to step 5:
If we divide 788 by 81, we get 9 and a remainder of 59.
Put 9 as the next digit of the answer. 
Result so far: 259.0
The remainder is 59 after subtracting 729 from 788.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

Let's proceed to step 6:
The number 81 fits into 590 7 times, leaving a remainder of 23.
Write down 7 as next digit of the result. 
Result so far: 259.7
Subtract 567 from 590 to get 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Step 7:
81 goes into 230 2 times with a remainder of 68.
The next digit of our result is 2. 
Result so far: 259.72
Subtract 162 from 230 to get 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

On to step 8:
81 can be fit into 680 8 times, resulting in a remainder of 32.
The number 8 becomes the next digit in our result. 
Result so far: 259.728
If we take 648 away from 680, we end up with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

On to step 9:
If we divide 320 by 81, we get 3 and a remainder of 77.
The next digit of our result is 3. 
Result so far: 259.7283
Deduct 243 from 320 and we're left with 77.
Since there are no more digits in the dividend, we add a zero to the remainder making it 770, and continue the process.

Moving on to step 10:
When dividing 770 by 81, we get 9 with a remainder of 41.
Put 9 as the next digit of the answer. 
Result so far: 259.72839
Deduct 729 from 770 and we're left with 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Step 11:
410 divided by 81 is 5 with a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 259.728395
Deduct 405 from 410 and we're left with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 12:
81 goes into 50 0 times with a remainder of 50.
The number 0 becomes the next digit in our result. 
Result so far: 259.728395
Subtracting 0 from 50 leaves us with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Going ahead to step 13:
500 divided by 81 is 6 with a remainder of 14.
The next digit of our result is 6. 
Result so far: 259.72839506
Subtract 486 from 500 to get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

The final result is 259.72839506 with a remainder of 1.4e-08.