Let's divide 21375 by 91
We want to figure out the number of times 21375 can be divided by 91.

Advancing to step 1:
91 goes into 2 0 times with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 91

Going ahead to step 2:
If we divide 21 by 91, we get 0 and a remainder of 21.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 21 after subtracting 0 from 21.
Include the next digit (3) from the dividend after 21, then repeat: 213 / 91

Going ahead to step 3:
213 divided by 91 is 2 with a remainder of 31.
Put 2 as the next digit of the answer. 
Result so far: 2.0
If we take 182 away from 213, we end up with 31.
Include the next digit (7) from the dividend after 31, then repeat: 317 / 91

Advancing to step 4:
If we divide 317 by 91, we get 3 and a remainder of 44.
Put 3 as the next digit of the answer. 
Result so far: 23.0
If we subtract 273 from 317, we get 44.
Fetch the next digit (5) from the dividend, attach it to 44 and continue: 445 / 91

Step 5:
91 can be fit into 445 4 times, resulting in a remainder of 81.
The next digit of our result is 4. 
Result so far: 234.0
If we take 364 away from 445, we end up 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.

Going ahead to step 6:
91 goes into 810 8 times with a remainder of 82.
Record the quotient 8 as the next digit in the result. 
Result so far: 234.8
The remainder is 82 after subtracting 728 from 810.
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 7:
If we divide 820 by 91, we get 9 and a remainder of 1.
Use 9 as the next digit of our solution. 
Result so far: 234.89
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.

Step 8:
91 goes into 10 0 times with a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 234.89
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.

Let's proceed to step 9:
The number 91 fits into 100 1 times, leaving a remainder of 9.
Write down 1 as next digit of the result. 
Result so far: 234.8901
Deduct 91 from 100 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 10:
90 divided by 91 is 0 with a remainder of 90.
The number 0 becomes the next digit in our result. 
Result so far: 234.8901
Subtracting 0 from 90 leaves us with 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

Let's proceed to step 11:
900 divided by 91 is 9 with a remainder of 81.
Write down 9 as next digit of the result. 
Result so far: 234.890109
Subtract 819 from 900 to get 81.
Since there are no more digits in the dividend, we add a zero to the remainder making it 810, and continue the process.

Advancing to step 12:
91 goes into 810 8 times with a remainder of 82.
Use 8 as the next digit of our solution. 
Result so far: 234.8901098
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 13:
91 can be fit into 820 9 times, resulting in a remainder of 1.
Put 9 as the next digit of the answer. 
Result so far: 234.89010989
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.

Our division results in 234.89010989 with a remaining 1e-09.