We're dividing 231239 by 866 
We want to figure out the number of times 231239 can be divided by 866.

Step 1:
866 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.
Take the next digit (3) from the dividend and append it to 2, then repeat: 23 / 866

Advancing to step 2:
866 can be fit into 23 0 times, resulting in a remainder of 23.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 23 after subtracting 0 from 23.
Take the next digit (1) from the dividend and append it to 23, then repeat: 231 / 866

Moving on to step 3:
When dividing 231 by 866, we get 0 with a remainder of 231.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 231, we get 231.
Take the next digit (2) from the dividend and append it to 231, then repeat: 2312 / 866

Step 4:
The number 866 fits into 2312 2 times, leaving a remainder of 580.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
If we take 1732 away from 2312, we end up with 580.
Include the next digit (3) from the dividend after 580, then repeat: 5803 / 866

Going ahead to step 5:
866 goes into 5803 6 times with a remainder of 607.
The number 6 becomes the next digit in our result. 
Result so far: 26.0
Deduct 5196 from 5803 and we're left with 607.
Include the next digit (9) from the dividend after 607, then repeat: 6079 / 866

Step 6:
The number 866 fits into 6079 7 times, leaving a remainder of 17.
Put 7 as the next digit of the answer. 
Result so far: 267.0
The remainder is 17 after subtracting 6062 from 6079.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Moving on to step 7:
170 divided by 866 is 0 with a remainder of 170.
Put 0 as the next digit of the answer. 
Result so far: 267.0
If we subtract 0 from 170, we get 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

Let's proceed to step 8:
When dividing 1700 by 866, we get 1 with a remainder of 834.
Put 1 as the next digit of the answer. 
Result so far: 267.01
If we subtract 866 from 1700, we get 834.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8340, and continue the process.

Moving on to step 9:
If we divide 8340 by 866, we get 9 and a remainder of 546.
Record the quotient 9 as the next digit in the result. 
Result so far: 267.019
Subtracting 7794 from 8340 leaves us with 546.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5460, and continue the process.

Advancing to step 10:
The number 866 fits into 5460 6 times, leaving a remainder of 264.
The number 6 becomes the next digit in our result. 
Result so far: 267.0196
If we take 5196 away from 5460, we end up with 264.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2640, and continue the process.

Let's proceed to step 11:
2640 divided by 866 is 3 with a remainder of 42.
Use 3 as the next digit of our solution. 
Result so far: 267.01963
The remainder is 42 after subtracting 2598 from 2640.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

On to step 12:
866 goes into 420 0 times with a remainder of 420.
Use 0 as the next digit of our solution. 
Result so far: 267.01963
If we take 0 away from 420, we end up with 420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4200, and continue the process.

Advancing to step 13:
866 goes into 4200 4 times with a remainder of 736.
Put 4 as the next digit of the answer. 
Result so far: 267.0196304
If we take 3464 away from 4200, we end up with 736.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7360, and continue the process.

Let's proceed to step 14:
866 goes into 7360 8 times with a remainder of 432.
The next digit of our result is 8. 
Result so far: 267.01963048
Subtract 6928 from 7360 to get 432.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4320, and continue the process.

After the division, we end up with 267.01963048 and a remainder of 4.32e-07.