855399 ÷ 91 
We're looking to find how many times 91 goes into 855399.

Step 1:
If we divide 8 by 91, we get 0 and a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Include the next digit (5) from the dividend after 8, then repeat: 85 / 91

Step 2:
91 goes into 85 0 times with a remainder of 85.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 85 after subtracting 0 from 85.
Append the next digit (5) from the dividend to 85 and continue with: 855 / 91

Step 3:
91 goes into 855 9 times with a remainder of 36.
Use 9 as the next digit of our solution. 
Result so far: 9.0
Subtracting 819 from 855 leaves us with 36.
Grab the next digit (3) from the dividend, add it to 36, then carry on: 363 / 91

Going ahead to step 4:
91 can be fit into 363 3 times, resulting in a remainder of 90.
Put 3 as the next digit of the answer. 
Result so far: 93.0
The remainder is 90 after subtracting 273 from 363.
Fetch the next digit (9) from the dividend, attach it to 90 and continue: 909 / 91

Advancing to step 5:
91 can be fit into 909 9 times, resulting in a remainder of 90.
Put 9 as the next digit of the answer. 
Result so far: 939.0
If we subtract 819 from 909, we get 90.
Take the next digit (9) from the dividend and append it to 90, then repeat: 909 / 91

Advancing to step 6:
909 divided by 91 is 9 with a remainder of 90.
The next digit of our result is 9. 
Result so far: 9399.0
Subtract 819 from 909 to get 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

Moving on to step 7:
When dividing 900 by 91, we get 9 with a remainder of 81.
The number 9 becomes the next digit in our result. 
Result so far: 9399.9
Subtracting 819 from 900 leaves us with 81.
Since there are no more digits in the dividend, we add a zero to the remainder making it 810, and continue the process.

Step 8:
If we divide 810 by 91, we get 8 and a remainder of 82.
Write down 8 as next digit of the result. 
Result so far: 9399.98
Deduct 728 from 810 and we're left with 82.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

Advancing to step 9:
91 goes into 820 9 times with a remainder of 1.
The number 9 becomes the next digit in our result. 
Result so far: 9399.989
If we subtract 819 from 820, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 10:
When dividing 10 by 91, we get 0 with a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 9399.989
Subtract 0 from 10 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 11:
91 can be fit into 100 1 times, resulting in a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 9399.98901
If we subtract 91 from 100, we get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

On to step 12:
The number 91 fits into 90 0 times, leaving a remainder of 90.
Put 0 as the next digit of the answer. 
Result so far: 9399.98901
The remainder is 90 after subtracting 0 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

Advancing to step 13:
When dividing 900 by 91, we get 9 with a remainder of 81.
Use 9 as the next digit of our solution. 
Result so far: 9399.9890109
Subtracting 819 from 900 leaves us with 81.
Since there are no more digits in the dividend, we add a zero to the remainder making it 810, and continue the process.

Moving on to step 14:
91 goes into 810 8 times with a remainder of 82.
Write down 8 as next digit of the result. 
Result so far: 9399.98901098
Subtracting 728 from 810 leaves us with 82.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

The final result is 9399.98901098 with a remainder of 8.2e-08.