We look at the division of 457746 by 21 
We're looking to find how many times 21 goes into 457746.

Advancing to step 1:
21 can be fit into 4 0 times, resulting in a remainder of 4.
Put 0 as the next digit of the answer. 
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

Moving on to step 2:
21 goes into 45 2 times with a remainder of 3.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
The remainder is 3 after subtracting 42 from 45.
Fetch the next digit (7) from the dividend, attach it to 3 and continue: 37 / 21

On to step 3:
21 goes into 37 1 times with a remainder of 16.
The next digit of our result is 1. 
Result so far: 21.0
Subtract 21 from 37 to get 16.
Fetch the next digit (7) from the dividend, attach it to 16 and continue: 167 / 21

Advancing to step 4:
When dividing 167 by 21, we get 7 with a remainder of 20.
Record the quotient 7 as the next digit in the result. 
Result so far: 217.0
The remainder is 20 after subtracting 147 from 167.
Append the next digit (4) from the dividend to 20 and continue with: 204 / 21

Advancing to step 5:
204 divided by 21 is 9 with a remainder of 15.
Write down 9 as next digit of the result. 
Result so far: 2179.0
Deduct 189 from 204 and we're left with 15.
Fetch the next digit (6) from the dividend, attach it to 15 and continue: 156 / 21

Step 6:
If we divide 156 by 21, we get 7 and a remainder of 9.
Use 7 as the next digit of our solution. 
Result so far: 21797.0
Subtract 147 from 156 to get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Going ahead to step 7:
21 can be fit into 90 4 times, resulting in a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 21797.4
Subtract 84 from 90 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 8:
The number 21 fits into 60 2 times, leaving a remainder of 18.
Write down 2 as next digit of the result. 
Result so far: 21797.42
If we subtract 42 from 60, we get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Moving on to step 9:
The number 21 fits into 180 8 times, leaving a remainder of 12.
The next digit of our result is 8. 
Result so far: 21797.428
If we subtract 168 from 180, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Moving on to step 10:
The number 21 fits into 120 5 times, leaving a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 21797.4285
If we subtract 105 from 120, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Let's proceed to step 11:
When dividing 150 by 21, we get 7 with a remainder of 3.
The number 7 becomes the next digit in our result. 
Result so far: 21797.42857
Subtracting 147 from 150 leaves us with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Going ahead to step 12:
21 can be fit into 30 1 times, resulting in a remainder of 9.
The next digit of our result is 1. 
Result so far: 21797.428571
Subtract 21 from 30 to get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Step 13:
The number 21 fits into 90 4 times, leaving a remainder of 6.
Use 4 as the next digit of our solution. 
Result so far: 21797.4285714
Subtracting 84 from 90 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 14:
When dividing 60 by 21, we get 2 with a remainder of 18.
Put 2 as the next digit of the answer. 
Result so far: 21797.42857142
If we subtract 42 from 60, we get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

After the division, we end up with 21797.42857142 and a remainder of 1.8e-08.