Let's divide 458450 by 21
We're looking to find how many times 21 goes into 458450.

Let's proceed to step 1:
21 can be fit into 4 0 times, resulting in 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.
Take the next digit (5) from the dividend and append it to 4, then repeat: 45 / 21

Going ahead to step 2:
If we divide 45 by 21, we get 2 and a remainder of 3.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Subtracting 42 from 45 leaves us with 3.
Include the next digit (8) from the dividend after 3, then repeat: 38 / 21

Step 3:
The number 21 fits into 38 1 times, leaving a remainder of 17.
Use 1 as the next digit of our solution. 
Result so far: 21.0
Subtracting 21 from 38 leaves us with 17.
Take the next digit (4) from the dividend and append it to 17, then repeat: 174 / 21

Step 4:
When dividing 174 by 21, we get 8 with a remainder of 6.
The number 8 becomes the next digit in our result. 
Result so far: 218.0
Deduct 168 from 174 and we're left with 6.
Bring next digit (5) of the dividend behind the 6 and repeat the process: 65 / 21

On to step 5:
21 goes into 65 3 times with a remainder of 2.
The next digit of our result is 3. 
Result so far: 2183.0
The remainder is 2 after subtracting 63 from 65.
Append the next digit (0) from the dividend to 2 and continue with: 20 / 21

Moving on to step 6:
20 divided by 21 is 0 with a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 21830.0
Subtract 0 from 20 to 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.

On to step 7:
If we divide 200 by 21, we get 9 and a remainder of 11.
Write down 9 as next digit of the result. 
Result so far: 21830.9
Subtracting 189 from 200 leaves us 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.

Going ahead to step 8:
When dividing 110 by 21, we get 5 with a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 21830.95
Subtracting 105 from 110 leaves us 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.

Let's proceed to step 9:
If we divide 50 by 21, we get 2 and a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 21830.952
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.

Let's proceed to step 10:
80 divided by 21 is 3 with a remainder of 17.
Record the quotient 3 as the next digit in the result. 
Result so far: 21830.9523
Subtracting 63 from 80 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.

Advancing to step 11:
When dividing 170 by 21, we get 8 with a remainder of 2.
Record the quotient 8 as the next digit in the result. 
Result so far: 21830.95238
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.

Moving on to step 12:
When dividing 20 by 21, we get 0 with a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 21830.95238
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.

Advancing to step 13:
When dividing 200 by 21, we get 9 with a remainder of 11.
The next digit of our result is 9. 
Result so far: 21830.9523809
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.

On to step 14:
If we divide 110 by 21, we get 5 and a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 21830.95238095
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.

Our division results in 21830.95238095 with a remaining 5e-09.