Let's divide 491912 by 21
We want to divide 491912 by 21.

Step 1:
When dividing 4 by 21, we get 0 with a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Append the next digit (9) from the dividend to 4 and continue with: 49 / 21

Moving on to step 2:
If we divide 49 by 21, we get 2 and a remainder of 7.
Put 2 as the next digit of the answer. 
Result so far: 2.0
The remainder is 7 after subtracting 42 from 49.
Take the next digit (1) from the dividend and append it to 7, then repeat: 71 / 21

Let's proceed to step 3:
If we divide 71 by 21, we get 3 and a remainder of 8.
Write down 3 as next digit of the result. 
Result so far: 23.0
Deduct 63 from 71 and we're left with 8.
Fetch the next digit (9) from the dividend, attach it to 8 and continue: 89 / 21

Moving on to step 4:
When dividing 89 by 21, we get 4 with a remainder of 5.
Put 4 as the next digit of the answer. 
Result so far: 234.0
The remainder is 5 after subtracting 84 from 89.
Append the next digit (1) from the dividend to 5 and continue with: 51 / 21

Going ahead to step 5:
21 goes into 51 2 times with a remainder of 9.
Record the quotient 2 as the next digit in the result. 
Result so far: 2342.0
If we take 42 away from 51, we end up with 9.
Append the next digit (2) from the dividend to 9 and continue with: 92 / 21

Advancing to step 6:
21 goes into 92 4 times with a remainder of 8.
Put 4 as the next digit of the answer. 
Result so far: 23424.0
The remainder is 8 after subtracting 84 from 92.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Step 7:
21 can be fit into 80 3 times, resulting in a remainder of 17.
Use 3 as the next digit of our solution. 
Result so far: 23424.3
If we subtract 63 from 80, we 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.

Moving on to step 8:
170 divided by 21 is 8 with a remainder of 2.
Write down 8 as next digit of the result. 
Result so far: 23424.38
The remainder is 2 after subtracting 168 from 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 9:
When dividing 20 by 21, we get 0 with a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 23424.38
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.

Moving on to step 10:
21 goes into 200 9 times with a remainder of 11.
The number 9 becomes the next digit in our result. 
Result so far: 23424.3809
If we take 189 away from 200, we end up 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.

Step 11:
When dividing 110 by 21, we get 5 with a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 23424.38095
Deduct 105 from 110 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.

Going ahead to step 12:
If we divide 50 by 21, we get 2 and a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 23424.380952
If we take 42 away from 50, we end up 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 13:
If we divide 80 by 21, we get 3 and a remainder of 17.
Put 3 as the next digit of the answer. 
Result so far: 23424.3809523
If we subtract 63 from 80, we 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.

Moving on to step 14:
If we divide 170 by 21, we get 8 and a remainder of 2.
Write down 8 as next digit of the result. 
Result so far: 23424.38095238
Deduct 168 from 170 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

The final result is 23424.38095238 with a remainder of 2e-09.