304286 divided by 21 
We want to figure out the number of times 304286 can be divided by 21.

Going ahead to step 1:
The number 21 fits into 3 0 times, leaving a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Grab the next digit (0) from the dividend, add it to 3, then carry on: 30 / 21

Step 2:
When dividing 30 by 21, we get 1 with a remainder of 9.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we take 21 away from 30, we end up with 9.
Append the next digit (4) from the dividend to 9 and continue with: 94 / 21

Moving on to step 3:
The number 21 fits into 94 4 times, leaving a remainder of 10.
Put 4 as the next digit of the answer. 
Result so far: 14.0
If we subtract 84 from 94, we get 10.
Bring next digit (2) of the dividend behind the 10 and repeat the process: 102 / 21

Let's proceed to step 4:
21 can be fit into 102 4 times, resulting in a remainder of 18.
Use 4 as the next digit of our solution. 
Result so far: 144.0
Subtracting 84 from 102 leaves us with 18.
Grab the next digit (8) from the dividend, add it to 18, then carry on: 188 / 21

Going ahead to step 5:
188 divided by 21 is 8 with a remainder of 20.
Write down 8 as next digit of the result. 
Result so far: 1448.0
The remainder is 20 after subtracting 168 from 188.
Grab the next digit (6) from the dividend, add it to 20, then carry on: 206 / 21

Going ahead to step 6:
21 can be fit into 206 9 times, resulting in a remainder of 17.
Use 9 as the next digit of our solution. 
Result so far: 14489.0
Subtracting 189 from 206 leaves us 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.

Moving on to step 7:
The number 21 fits into 170 8 times, leaving a remainder of 2.
The next digit of our result is 8. 
Result so far: 14489.8
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.

On to step 8:
21 goes into 20 0 times with a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 14489.8
Deduct 0 from 20 and we're left 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 9:
21 can be fit into 200 9 times, resulting in a remainder of 11.
The number 9 becomes the next digit in our result. 
Result so far: 14489.809
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.

Moving on to step 10:
If we divide 110 by 21, we get 5 and a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 14489.8095
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.

Going ahead to step 11:
When dividing 50 by 21, we get 2 with a remainder of 8.
The next digit of our result is 2. 
Result so far: 14489.80952
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.

Let's proceed to step 12:
The number 21 fits into 80 3 times, leaving a remainder of 17.
The next digit of our result is 3. 
Result so far: 14489.809523
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.

On to step 13:
21 can be fit into 170 8 times, resulting in a remainder of 2.
The next digit of our result is 8. 
Result so far: 14489.8095238
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.

Let's proceed to step 14:
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: 14489.8095238
Subtracting 0 from 20 leaves us 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.

After the division, we end up with 14489.8095238 and a remainder of 2e-08.