We divide 511814 by 21
We want to figure out the number of times 511814 can be divided by 21.

On to step 1:
5 divided by 21 is 0 with a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Bring next digit (1) of the dividend behind the 5 and repeat the process: 51 / 21

Advancing to step 2:
If we divide 51 by 21, we get 2 and a remainder of 9.
Write down 2 as next digit of the result. 
Result so far: 2.0
The remainder is 9 after subtracting 42 from 51.
Take the next digit (1) from the dividend and append it to 9, then repeat: 91 / 21

Let's proceed to step 3:
The number 21 fits into 91 4 times, leaving a remainder of 7.
The next digit of our result is 4. 
Result so far: 24.0
Deduct 84 from 91 and we're left with 7.
Bring next digit (8) of the dividend behind the 7 and repeat the process: 78 / 21

On to step 4:
21 can be fit into 78 3 times, resulting in a remainder of 15.
Use 3 as the next digit of our solution. 
Result so far: 243.0
If we subtract 63 from 78, we get 15.
Grab the next digit (1) from the dividend, add it to 15, then carry on: 151 / 21

Let's proceed to step 5:
151 divided by 21 is 7 with a remainder of 4.
The number 7 becomes the next digit in our result. 
Result so far: 2437.0
If we subtract 147 from 151, we get 4.
Fetch the next digit (4) from the dividend, attach it to 4 and continue: 44 / 21

Step 6:
The number 21 fits into 44 2 times, leaving a remainder of 2.
Record the quotient 2 as the next digit in the result. 
Result so far: 24372.0
Subtract 42 from 44 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Advancing to step 7:
When dividing 20 by 21, we get 0 with a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 24372.0
If we subtract 0 from 20, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 8:
If we divide 200 by 21, we get 9 and a remainder of 11.
Record the quotient 9 as the next digit in the result. 
Result so far: 24372.09
Deduct 189 from 200 and we're left with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Moving on to step 9:
21 can be fit into 110 5 times, resulting in a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 24372.095
If we take 105 away from 110, we end up 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.

Moving on to step 10:
50 divided by 21 is 2 with a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 24372.0952
Deduct 42 from 50 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 11:
21 can be fit into 80 3 times, resulting in a remainder of 17.
Record the quotient 3 as the next digit in the result. 
Result so far: 24372.09523
Subtract 63 from 80 to get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Advancing to step 12:
The number 21 fits into 170 8 times, leaving a remainder of 2.
The number 8 becomes the next digit in our result. 
Result so far: 24372.095238
If we subtract 168 from 170, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 13:
If we divide 20 by 21, we get 0 and a remainder of 20.
The next digit of our result is 0. 
Result so far: 24372.095238
If we take 0 away from 20, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 14:
When dividing 200 by 21, we get 9 with a remainder of 11.
Put 9 as the next digit of the answer. 
Result so far: 24372.09523809
If we subtract 189 from 200, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

The final result is 24372.09523809 with a remainder of 1.1e-08.