Let's divide 810887 by 21
Our goal is to divide 810887 by 21.

Let's proceed to step 1:
When dividing 8 by 21, we get 0 with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Append the next digit (1) from the dividend to 8 and continue with: 81 / 21

Let's proceed to step 2:
When dividing 81 by 21, we get 3 with a remainder of 18.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
Subtract 63 from 81 to get 18.
Take the next digit (0) from the dividend and append it to 18, then repeat: 180 / 21

Step 3:
The number 21 fits into 180 8 times, leaving a remainder of 12.
Record the quotient 8 as the next digit in the result. 
Result so far: 38.0
Deduct 168 from 180 and we're left with 12.
Take the next digit (8) from the dividend and append it to 12, then repeat: 128 / 21

Going ahead to step 4:
When dividing 128 by 21, we get 6 with a remainder of 2.
Use 6 as the next digit of our solution. 
Result so far: 386.0
Subtracting 126 from 128 leaves us with 2.
Fetch the next digit (8) from the dividend, attach it to 2 and continue: 28 / 21

On to step 5:
If we divide 28 by 21, we get 1 and a remainder of 7.
Record the quotient 1 as the next digit in the result. 
Result so far: 3861.0
Subtract 21 from 28 to get 7.
Bring next digit (7) of the dividend behind the 7 and repeat the process: 77 / 21

On to step 6:
The number 21 fits into 77 3 times, leaving a remainder of 14.
Use 3 as the next digit of our solution. 
Result so far: 38613.0
Subtract 63 from 77 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.

Let's proceed to step 7:
140 divided by 21 is 6 with a remainder of 14.
Put 6 as the next digit of the answer. 
Result so far: 38613.6
Deduct 126 from 140 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Going ahead to step 8:
140 divided by 21 is 6 with a remainder of 14.
Record the quotient 6 as the next digit in the result. 
Result so far: 38613.66
If we subtract 126 from 140, we 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.

In conclusion, the division gives 38613.66 with a balance of 0.014.