We look at the division of 12890711 by 866 
We want to divide 12890711 by 866.

Advancing to step 1:
866 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 / 866

Advancing to step 2:
When dividing 12 by 866, we get 0 with a remainder of 12.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 12 after subtracting 0 from 12.
Fetch the next digit (8) from the dividend, attach it to 12 and continue: 128 / 866

Moving on to step 3:
866 goes into 128 0 times with a remainder of 128.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 128 after subtracting 0 from 128.
Take the next digit (9) from the dividend and append it to 128, then repeat: 1289 / 866

Step 4:
If we divide 1289 by 866, we get 1 and a remainder of 423.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we subtract 866 from 1289, we get 423.
Bring next digit (0) of the dividend behind the 423 and repeat the process: 4230 / 866

On to step 5:
The number 866 fits into 4230 4 times, leaving a remainder of 766.
Record the quotient 4 as the next digit in the result. 
Result so far: 14.0
Subtracting 3464 from 4230 leaves us with 766.
Fetch the next digit (7) from the dividend, attach it to 766 and continue: 7667 / 866

Let's proceed to step 6:
If we divide 7667 by 866, we get 8 and a remainder of 739.
Put 8 as the next digit of the answer. 
Result so far: 148.0
If we subtract 6928 from 7667, we get 739.
Include the next digit (1) from the dividend after 739, then repeat: 7391 / 866

Let's proceed to step 7:
866 goes into 7391 8 times with a remainder of 463.
The next digit of our result is 8. 
Result so far: 1488.0
The remainder is 463 after subtracting 6928 from 7391.
Take the next digit (1) from the dividend and append it to 463, then repeat: 4631 / 866

Going ahead to step 8:
866 can be fit into 4631 5 times, resulting in a remainder of 301.
Put 5 as the next digit of the answer. 
Result so far: 14885.0
If we take 4330 away from 4631, we end up with 301.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3010, and continue the process.

Step 9:
866 goes into 3010 3 times with a remainder of 412.
Record the quotient 3 as the next digit in the result. 
Result so far: 14885.3
Deduct 2598 from 3010 and we're left with 412.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4120, and continue the process.

On to step 10:
866 goes into 4120 4 times with a remainder of 656.
Use 4 as the next digit of our solution. 
Result so far: 14885.34
Subtracting 3464 from 4120 leaves us with 656.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6560, and continue the process.

Moving on to step 11:
866 goes into 6560 7 times with a remainder of 498.
Use 7 as the next digit of our solution. 
Result so far: 14885.347
Subtract 6062 from 6560 to get 498.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4980, and continue the process.

Step 12:
When dividing 4980 by 866, we get 5 with a remainder of 650.
Use 5 as the next digit of our solution. 
Result so far: 14885.3475
The remainder is 650 after subtracting 4330 from 4980.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6500, and continue the process.

On to step 13:
866 can be fit into 6500 7 times, resulting in a remainder of 438.
Record the quotient 7 as the next digit in the result. 
Result so far: 14885.34757
If we subtract 6062 from 6500, we get 438.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4380, and continue the process.

Going ahead to step 14:
866 goes into 4380 5 times with a remainder of 50.
Use 5 as the next digit of our solution. 
Result so far: 14885.347575
The remainder is 50 after subtracting 4330 from 4380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Going ahead to step 15:
When dividing 500 by 866, we get 0 with a remainder of 500.
Use 0 as the next digit of our solution. 
Result so far: 14885.347575
Subtract 0 from 500 to get 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5000, and continue the process.

Going ahead to step 16:
If we divide 5000 by 866, we get 5 and a remainder of 670.
The number 5 becomes the next digit in our result. 
Result so far: 14885.34757505
Subtracting 4330 from 5000 leaves us with 670.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6700, and continue the process.

Our division results in 14885.34757505 with a remaining 6.7e-07.