21257512 divided by 457 
Our goal is to divide 21257512 by 457.

Advancing to step 1:
457 goes into 2 0 times with a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 457

On to step 2:
457 goes into 21 0 times with a remainder of 21.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 21, we get 21.
Bring next digit (2) of the dividend behind the 21 and repeat the process: 212 / 457

Let's proceed to step 3:
The number 457 fits into 212 0 times, leaving a remainder of 212.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 212 to get 212.
Grab the next digit (5) from the dividend, add it to 212, then carry on: 2125 / 457

Step 4:
When dividing 2125 by 457, we get 4 with a remainder of 297.
Use 4 as the next digit of our solution. 
Result so far: 4.0
Deduct 1828 from 2125 and we're left with 297.
Append the next digit (7) from the dividend to 297 and continue with: 2977 / 457

Advancing to step 5:
When dividing 2977 by 457, we get 6 with a remainder of 235.
Put 6 as the next digit of the answer. 
Result so far: 46.0
If we subtract 2742 from 2977, we get 235.
Fetch the next digit (5) from the dividend, attach it to 235 and continue: 2355 / 457

Step 6:
The number 457 fits into 2355 5 times, leaving a remainder of 70.
The number 5 becomes the next digit in our result. 
Result so far: 465.0
If we subtract 2285 from 2355, we get 70.
Grab the next digit (1) from the dividend, add it to 70, then carry on: 701 / 457

Going ahead to step 7:
The number 457 fits into 701 1 times, leaving a remainder of 244.
Put 1 as the next digit of the answer. 
Result so far: 4651.0
Subtract 457 from 701 to get 244.
Fetch the next digit (2) from the dividend, attach it to 244 and continue: 2442 / 457

On to step 8:
The number 457 fits into 2442 5 times, leaving a remainder of 157.
Use 5 as the next digit of our solution. 
Result so far: 46515.0
Deduct 2285 from 2442 and we're left with 157.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1570, and continue the process.

Step 9:
1570 divided by 457 is 3 with a remainder of 199.
The number 3 becomes the next digit in our result. 
Result so far: 46515.3
Deduct 1371 from 1570 and we're left with 199.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1990, and continue the process.

On to step 10:
457 can be fit into 1990 4 times, resulting in a remainder of 162.
Use 4 as the next digit of our solution. 
Result so far: 46515.34
Subtract 1828 from 1990 to get 162.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1620, and continue the process.

Step 11:
1620 divided by 457 is 3 with a remainder of 249.
Use 3 as the next digit of our solution. 
Result so far: 46515.343
Subtract 1371 from 1620 to get 249.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2490, and continue the process.

On to step 12:
2490 divided by 457 is 5 with a remainder of 205.
Write down 5 as next digit of the result. 
Result so far: 46515.3435
Subtract 2285 from 2490 to get 205.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2050, and continue the process.

On to step 13:
457 goes into 2050 4 times with a remainder of 222.
Put 4 as the next digit of the answer. 
Result so far: 46515.34354
The remainder is 222 after subtracting 1828 from 2050.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2220, and continue the process.

Step 14:
When dividing 2220 by 457, we get 4 with a remainder of 392.
Record the quotient 4 as the next digit in the result. 
Result so far: 46515.343544
The remainder is 392 after subtracting 1828 from 2220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3920, and continue the process.

In conclusion, the division gives 46515.343544 with a balance of 3.92e-05.