We're dividing 12957048 by 421 
We want to divide 12957048 by 421.

Let's proceed to step 1:
421 goes into 1 0 times with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Grab the next digit (2) from the dividend, add it to 1, then carry on: 12 / 421

On to step 2:
421 goes into 12 0 times with a remainder of 12.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 12, we get 12.
Append the next digit (9) from the dividend to 12 and continue with: 129 / 421

Step 3:
129 divided by 421 is 0 with a remainder of 129.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 129, we end up with 129.
Take the next digit (5) from the dividend and append it to 129, then repeat: 1295 / 421

On to step 4:
When dividing 1295 by 421, we get 3 with a remainder of 32.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
Subtracting 1263 from 1295 leaves us with 32.
Include the next digit (7) from the dividend after 32, then repeat: 327 / 421

Going ahead to step 5:
If we divide 327 by 421, we get 0 and a remainder of 327.
The number 0 becomes the next digit in our result. 
Result so far: 30.0
Deduct 0 from 327 and we're left with 327.
Grab the next digit (0) from the dividend, add it to 327, then carry on: 3270 / 421

Advancing to step 6:
421 goes into 3270 7 times with a remainder of 323.
The number 7 becomes the next digit in our result. 
Result so far: 307.0
Subtracting 2947 from 3270 leaves us with 323.
Bring next digit (4) of the dividend behind the 323 and repeat the process: 3234 / 421

Let's proceed to step 7:
3234 divided by 421 is 7 with a remainder of 287.
Use 7 as the next digit of our solution. 
Result so far: 3077.0
Subtracting 2947 from 3234 leaves us with 287.
Take the next digit (8) from the dividend and append it to 287, then repeat: 2878 / 421

Let's proceed to step 8:
The number 421 fits into 2878 6 times, leaving a remainder of 352.
The number 6 becomes the next digit in our result. 
Result so far: 30776.0
Subtract 2526 from 2878 to get 352.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3520, and continue the process.

Going ahead to step 9:
If we divide 3520 by 421, we get 8 and a remainder of 152.
Write down 8 as next digit of the result. 
Result so far: 30776.8
Deduct 3368 from 3520 and we're left with 152.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1520, and continue the process.

Going ahead to step 10:
421 goes into 1520 3 times with a remainder of 257.
The next digit of our result is 3. 
Result so far: 30776.83
Subtracting 1263 from 1520 leaves us with 257.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2570, and continue the process.

Step 11:
When dividing 2570 by 421, we get 6 with a remainder of 44.
The next digit of our result is 6. 
Result so far: 30776.836
Subtract 2526 from 2570 to get 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Advancing to step 12:
421 goes into 440 1 times with a remainder of 19.
Put 1 as the next digit of the answer. 
Result so far: 30776.8361
Deduct 421 from 440 and we're left with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Going ahead to step 13:
If we divide 190 by 421, we get 0 and a remainder of 190.
The next digit of our result is 0. 
Result so far: 30776.8361
If we subtract 0 from 190, we get 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1900, and continue the process.

Step 14:
421 can be fit into 1900 4 times, resulting in a remainder of 216.
Write down 4 as next digit of the result. 
Result so far: 30776.836104
If we take 1684 away from 1900, we end up with 216.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2160, and continue the process.

Let's proceed to step 15:
2160 divided by 421 is 5 with a remainder of 55.
Use 5 as the next digit of our solution. 
Result so far: 30776.8361045
If we subtract 2105 from 2160, we get 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Step 16:
If we divide 550 by 421, we get 1 and a remainder of 129.
Put 1 as the next digit of the answer. 
Result so far: 30776.83610451
If we subtract 421 from 550, we get 129.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1290, and continue the process.

The final result is 30776.83610451 with a remainder of 1.29e-07.