We're dividing 858257 by 86 
Let's see how many times 86 fits into 858257.

Going ahead to step 1:
86 can be fit into 8 0 times, resulting in a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Bring next digit (5) of the dividend behind the 8 and repeat the process: 85 / 86

Advancing to step 2:
86 goes into 85 0 times with a remainder of 85.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 85 after subtracting 0 from 85.
Bring next digit (8) of the dividend behind the 85 and repeat the process: 858 / 86

On to step 3:
The number 86 fits into 858 9 times, leaving a remainder of 84.
Put 9 as the next digit of the answer. 
Result so far: 9.0
Deduct 774 from 858 and we're left with 84.
Fetch the next digit (2) from the dividend, attach it to 84 and continue: 842 / 86

On to step 4:
842 divided by 86 is 9 with a remainder of 68.
Use 9 as the next digit of our solution. 
Result so far: 99.0
If we subtract 774 from 842, we get 68.
Bring next digit (5) of the dividend behind the 68 and repeat the process: 685 / 86

Moving on to step 5:
685 divided by 86 is 7 with a remainder of 83.
Write down 7 as next digit of the result. 
Result so far: 997.0
Subtracting 602 from 685 leaves us with 83.
Grab the next digit (7) from the dividend, add it to 83, then carry on: 837 / 86

Step 6:
If we divide 837 by 86, we get 9 and a remainder of 63.
The next digit of our result is 9. 
Result so far: 9979.0
If we subtract 774 from 837, we get 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Step 7:
If we divide 630 by 86, we get 7 and a remainder of 28.
Record the quotient 7 as the next digit in the result. 
Result so far: 9979.7
If we subtract 602 from 630, we get 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

On to step 8:
280 divided by 86 is 3 with a remainder of 22.
Use 3 as the next digit of our solution. 
Result so far: 9979.73
If we subtract 258 from 280, we get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Advancing to step 9:
86 can be fit into 220 2 times, resulting in a remainder of 48.
The number 2 becomes the next digit in our result. 
Result so far: 9979.732
If we take 172 away from 220, we end up with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Advancing to step 10:
When dividing 480 by 86, we get 5 with a remainder of 50.
Put 5 as the next digit of the answer. 
Result so far: 9979.7325
If we subtract 430 from 480, we get 50.
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 11:
If we divide 500 by 86, we get 5 and a remainder of 70.
Use 5 as the next digit of our solution. 
Result so far: 9979.73255
If we subtract 430 from 500, we get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

The final result is 9979.73255 with a remainder of 7e-05.