We're dividing 12457380 by 809 
Our goal is to divide 12457380 by 809.

Advancing to step 1:
1 divided by 809 is 0 with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Append the next digit (2) from the dividend to 1 and continue with: 12 / 809

On to step 2:
If we divide 12 by 809, we get 0 and a remainder of 12.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 12 to get 12.
Bring next digit (4) of the dividend behind the 12 and repeat the process: 124 / 809

Advancing to step 3:
The number 809 fits into 124 0 times, leaving a remainder of 124.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 124 after subtracting 0 from 124.
Grab the next digit (5) from the dividend, add it to 124, then carry on: 1245 / 809

Advancing to step 4:
1245 divided by 809 is 1 with a remainder of 436.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtracting 809 from 1245 leaves us with 436.
Take the next digit (7) from the dividend and append it to 436, then repeat: 4367 / 809

Step 5:
When dividing 4367 by 809, we get 5 with a remainder of 322.
The next digit of our result is 5. 
Result so far: 15.0
If we take 4045 away from 4367, we end up with 322.
Take the next digit (3) from the dividend and append it to 322, then repeat: 3223 / 809

Advancing to step 6:
3223 divided by 809 is 3 with a remainder of 796.
The number 3 becomes the next digit in our result. 
Result so far: 153.0
Subtracting 2427 from 3223 leaves us with 796.
Take the next digit (8) from the dividend and append it to 796, then repeat: 7968 / 809

Moving on to step 7:
7968 divided by 809 is 9 with a remainder of 687.
Record the quotient 9 as the next digit in the result. 
Result so far: 1539.0
The remainder is 687 after subtracting 7281 from 7968.
Grab the next digit (0) from the dividend, add it to 687, then carry on: 6870 / 809

Moving on to step 8:
809 can be fit into 6870 8 times, resulting in a remainder of 398.
The next digit of our result is 8. 
Result so far: 15398.0
If we take 6472 away from 6870, we end up with 398.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3980, and continue the process.

Going ahead to step 9:
The number 809 fits into 3980 4 times, leaving a remainder of 744.
Use 4 as the next digit of our solution. 
Result so far: 15398.4
Subtracting 3236 from 3980 leaves us with 744.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7440, and continue the process.

Advancing to step 10:
The number 809 fits into 7440 9 times, leaving a remainder of 159.
Write down 9 as next digit of the result. 
Result so far: 15398.49
Deduct 7281 from 7440 and we're left with 159.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1590, and continue the process.

On to step 11:
809 can be fit into 1590 1 times, resulting in a remainder of 781.
The next digit of our result is 1. 
Result so far: 15398.491
If we take 809 away from 1590, we end up with 781.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7810, and continue the process.

Going ahead to step 12:
809 can be fit into 7810 9 times, resulting in a remainder of 529.
Record the quotient 9 as the next digit in the result. 
Result so far: 15398.4919
Deduct 7281 from 7810 and we're left with 529.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5290, and continue the process.

Going ahead to step 13:
The number 809 fits into 5290 6 times, leaving a remainder of 436.
The next digit of our result is 6. 
Result so far: 15398.49196
If we take 4854 away from 5290, we end up with 436.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4360, and continue the process.

Advancing to step 14:
809 can be fit into 4360 5 times, resulting in a remainder of 315.
Put 5 as the next digit of the answer. 
Result so far: 15398.491965
If we subtract 4045 from 4360, we get 315.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3150, and continue the process.

Advancing to step 15:
If we divide 3150 by 809, we get 3 and a remainder of 723.
Write down 3 as next digit of the result. 
Result so far: 15398.4919653
Subtract 2427 from 3150 to get 723.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7230, and continue the process.

Going ahead to step 16:
If we divide 7230 by 809, we get 8 and a remainder of 758.
Write down 8 as next digit of the result. 
Result so far: 15398.49196538
Subtract 6472 from 7230 to get 758.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7580, and continue the process.

After the division, we end up with 15398.49196538 and a remainder of 7.58e-07.