494930 divided by 21 
We're looking to find how many times 21 goes into 494930.

Moving on to step 1:
4 divided by 21 is 0 with a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Bring next digit (9) of the dividend behind the 4 and repeat the process: 49 / 21

Step 2:
21 can be fit into 49 2 times, resulting in a remainder of 7.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
If we subtract 42 from 49, we get 7.
Grab the next digit (4) from the dividend, add it to 7, then carry on: 74 / 21

Advancing to step 3:
21 goes into 74 3 times with a remainder of 11.
Use 3 as the next digit of our solution. 
Result so far: 23.0
Deduct 63 from 74 and we're left with 11.
Take the next digit (9) from the dividend and append it to 11, then repeat: 119 / 21

Step 4:
The number 21 fits into 119 5 times, leaving a remainder of 14.
The next digit of our result is 5. 
Result so far: 235.0
If we subtract 105 from 119, we get 14.
Fetch the next digit (3) from the dividend, attach it to 14 and continue: 143 / 21

On to step 5:
21 can be fit into 143 6 times, resulting in a remainder of 17.
Put 6 as the next digit of the answer. 
Result so far: 2356.0
Subtracting 126 from 143 leaves us with 17.
Fetch the next digit (0) from the dividend, attach it to 17 and continue: 170 / 21

Advancing to step 6:
21 goes into 170 8 times with a remainder of 2.
The next digit of our result is 8. 
Result so far: 23568.0
If we take 168 away from 170, we end up 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.

Let's proceed to step 7:
21 can be fit into 20 0 times, resulting in a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 23568.0
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.

On to step 8:
21 goes into 200 9 times with a remainder of 11.
The number 9 becomes the next digit in our result. 
Result so far: 23568.09
Subtract 189 from 200 to 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.

Step 9:
21 can be fit into 110 5 times, resulting in a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 23568.095
Subtract 105 from 110 to get 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 10:
21 can be fit into 50 2 times, resulting in a remainder of 8.
The next digit of our result is 2. 
Result so far: 23568.0952
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.

Going ahead to step 11:
21 goes into 80 3 times with a remainder of 17.
The next digit of our result is 3. 
Result so far: 23568.09523
Deduct 63 from 80 and we're left with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Let's proceed to step 12:
21 goes into 170 8 times with a remainder of 2.
The next digit of our result is 8. 
Result so far: 23568.095238
If we take 168 away from 170, we end up 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.

Let's proceed to step 13:
If we divide 20 by 21, we get 0 and a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 23568.095238
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 14:
200 divided by 21 is 9 with a remainder of 11.
The next digit of our result is 9. 
Result so far: 23568.09523809
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 23568.09523809 with a remainder of 1.1e-08.