We're dividing 458720 by 21 
We're looking to find how many times 21 goes into 458720.

Advancing to step 1:
The number 21 fits into 4 0 times, leaving a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Include the next digit (5) from the dividend after 4, then repeat: 45 / 21

On to step 2:
If we divide 45 by 21, we get 2 and a remainder of 3.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Subtract 42 from 45 to get 3.
Grab the next digit (8) from the dividend, add it to 3, then carry on: 38 / 21

Let's proceed to step 3:
21 can be fit into 38 1 times, resulting in a remainder of 17.
Use 1 as the next digit of our solution. 
Result so far: 21.0
If we subtract 21 from 38, we get 17.
Grab the next digit (7) from the dividend, add it to 17, then carry on: 177 / 21

Let's proceed to step 4:
The number 21 fits into 177 8 times, leaving a remainder of 9.
The next digit of our result is 8. 
Result so far: 218.0
If we take 168 away from 177, we end up with 9.
Bring next digit (2) of the dividend behind the 9 and repeat the process: 92 / 21

On to step 5:
21 can be fit into 92 4 times, resulting in a remainder of 8.
The next digit of our result is 4. 
Result so far: 2184.0
If we subtract 84 from 92, we get 8.
Append the next digit (0) from the dividend to 8 and continue with: 80 / 21

Advancing to step 6:
21 goes into 80 3 times with a remainder of 17.
The next digit of our result is 3. 
Result so far: 21843.0
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.

Advancing to step 7:
21 can be fit into 170 8 times, resulting in a remainder of 2.
Use 8 as the next digit of our solution. 
Result so far: 21843.8
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.

Advancing to step 8:
When dividing 20 by 21, we get 0 with a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 21843.8
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.

Let's proceed to step 9:
If we divide 200 by 21, we get 9 and a remainder of 11.
The number 9 becomes the next digit in our result. 
Result so far: 21843.809
The remainder is 11 after subtracting 189 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

On to step 10:
The number 21 fits into 110 5 times, leaving a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 21843.8095
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.

Step 11:
21 goes into 50 2 times with a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 21843.80952
The remainder is 8 after subtracting 42 from 50.
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:
21 can be fit into 80 3 times, resulting in a remainder of 17.
Put 3 as the next digit of the answer. 
Result so far: 21843.809523
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.

Advancing to step 13:
170 divided by 21 is 8 with a remainder of 2.
Record the quotient 8 as the next digit in the result. 
Result so far: 21843.8095238
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.

Step 14:
If we divide 20 by 21, we get 0 and a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 21843.8095238
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.

After the division, we end up with 21843.8095238 and a remainder of 2e-08.