We're dividing 86831 by 80 
Let's see how many times 80 fits into 86831.

Let's proceed to step 1:
8 divided by 80 is 0 with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Take the next digit (6) from the dividend and append it to 8, then repeat: 86 / 80

Advancing to step 2:
80 can be fit into 86 1 times, resulting in a remainder of 6.
The next digit of our result is 1. 
Result so far: 1.0
Deduct 80 from 86 and we're left with 6.
Bring next digit (8) of the dividend behind the 6 and repeat the process: 68 / 80

Going ahead to step 3:
80 can be fit into 68 0 times, resulting in a remainder of 68.
Record the quotient 0 as the next digit in the result. 
Result so far: 10.0
If we take 0 away from 68, we end up with 68.
Grab the next digit (3) from the dividend, add it to 68, then carry on: 683 / 80

Let's proceed to step 4:
When dividing 683 by 80, we get 8 with a remainder of 43.
Put 8 as the next digit of the answer. 
Result so far: 108.0
Subtracting 640 from 683 leaves us with 43.
Append the next digit (1) from the dividend to 43 and continue with: 431 / 80

Let's proceed to step 5:
80 goes into 431 5 times with a remainder of 31.
The next digit of our result is 5. 
Result so far: 1085.0
Deduct 400 from 431 and we're left with 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Going ahead to step 6:
310 divided by 80 is 3 with a remainder of 70.
The next digit of our result is 3. 
Result so far: 1085.3
The remainder is 70 after subtracting 240 from 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Moving on to step 7:
700 divided by 80 is 8 with a remainder of 60.
The number 8 becomes the next digit in our result. 
Result so far: 1085.38
If we subtract 640 from 700, we get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Going ahead to step 8:
80 goes into 600 7 times with a remainder of 40.
Write down 7 as next digit of the result. 
Result so far: 1085.387
Subtract 560 from 600 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Going ahead to step 9:
80 goes into 400 5 times with a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 1085.3875
If we take 400 away from 400, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 10:
The number 80 fits into 0 0 times, leaving a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 1085.3875
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 11:
The number 80 fits into 0 0 times, leaving a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 1085.3875
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 1085.3875 and a remainder of 0.0.