21853 ÷ 91 
We're looking to find how many times 91 goes into 21853.

Let's proceed to step 1:
2 divided by 91 is 0 with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 91

On to step 2:
When dividing 21 by 91, we get 0 with a remainder of 21.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 21 and we're left with 21.
Grab the next digit (8) from the dividend, add it to 21, then carry on: 218 / 91

On to step 3:
The number 91 fits into 218 2 times, leaving a remainder of 36.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
If we subtract 182 from 218, we get 36.
Take the next digit (5) from the dividend and append it to 36, then repeat: 365 / 91

Moving on to step 4:
If we divide 365 by 91, we get 4 and a remainder of 1.
Record the quotient 4 as the next digit in the result. 
Result so far: 24.0
If we subtract 364 from 365, we get 1.
Append the next digit (3) from the dividend to 1 and continue with: 13 / 91

Advancing to step 5:
91 can be fit into 13 0 times, resulting in a remainder of 13.
Write down 0 as next digit of the result. 
Result so far: 240.0
Deduct 0 from 13 and we're left with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Going ahead to step 6:
91 goes into 130 1 times with a remainder of 39.
Write down 1 as next digit of the result. 
Result so far: 240.1
Deduct 91 from 130 and we're left with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Going ahead to step 7:
If we divide 390 by 91, we get 4 and a remainder of 26.
Record the quotient 4 as the next digit in the result. 
Result so far: 240.14
Deduct 364 from 390 and we're left with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

On to step 8:
91 can be fit into 260 2 times, resulting in a remainder of 78.
The next digit of our result is 2. 
Result so far: 240.142
Deduct 182 from 260 and we're left with 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Step 9:
91 goes into 780 8 times with a remainder of 52.
Record the quotient 8 as the next digit in the result. 
Result so far: 240.1428
Subtracting 728 from 780 leaves us with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Step 10:
If we divide 520 by 91, we get 5 and a remainder of 65.
Write down 5 as next digit of the result. 
Result so far: 240.14285
Subtract 455 from 520 to get 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Advancing to step 11:
The number 91 fits into 650 7 times, leaving a remainder of 13.
Record the quotient 7 as the next digit in the result. 
Result so far: 240.142857
Subtract 637 from 650 to get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Going ahead to step 12:
When dividing 130 by 91, we get 1 with a remainder of 39.
Write down 1 as next digit of the result. 
Result so far: 240.1428571
If we take 91 away from 130, we end up with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

On to step 13:
91 goes into 390 4 times with a remainder of 26.
The next digit of our result is 4. 
Result so far: 240.14285714
If we take 364 away from 390, we end up with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Our division results in 240.14285714 with a remaining 2.6e-08.