21238107 divided by 852 
Let's see how many times 852 fits into 21238107.

Going ahead to step 1:
When dividing 2 by 852, we get 0 with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 852

Let's proceed to step 2:
21 divided by 852 is 0 with a remainder of 21.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 21 leaves us with 21.
Take the next digit (2) from the dividend and append it to 21, then repeat: 212 / 852

Going ahead to step 3:
852 goes into 212 0 times with a remainder of 212.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 212 and we're left with 212.
Fetch the next digit (3) from the dividend, attach it to 212 and continue: 2123 / 852

Step 4:
2123 divided by 852 is 2 with a remainder of 419.
Use 2 as the next digit of our solution. 
Result so far: 2.0
If we subtract 1704 from 2123, we get 419.
Fetch the next digit (8) from the dividend, attach it to 419 and continue: 4198 / 852

On to step 5:
852 goes into 4198 4 times with a remainder of 790.
Write down 4 as next digit of the result. 
Result so far: 24.0
Subtract 3408 from 4198 to get 790.
Grab the next digit (1) from the dividend, add it to 790, then carry on: 7901 / 852

On to step 6:
The number 852 fits into 7901 9 times, leaving a remainder of 233.
The next digit of our result is 9. 
Result so far: 249.0
If we subtract 7668 from 7901, we get 233.
Include the next digit (0) from the dividend after 233, then repeat: 2330 / 852

Step 7:
The number 852 fits into 2330 2 times, leaving a remainder of 626.
Put 2 as the next digit of the answer. 
Result so far: 2492.0
Subtracting 1704 from 2330 leaves us with 626.
Take the next digit (7) from the dividend and append it to 626, then repeat: 6267 / 852

Let's proceed to step 8:
6267 divided by 852 is 7 with a remainder of 303.
Put 7 as the next digit of the answer. 
Result so far: 24927.0
If we take 5964 away from 6267, we end up with 303.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3030, and continue the process.

Moving on to step 9:
If we divide 3030 by 852, we get 3 and a remainder of 474.
Use 3 as the next digit of our solution. 
Result so far: 24927.3
If we take 2556 away from 3030, we end up with 474.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4740, and continue the process.

Step 10:
4740 divided by 852 is 5 with a remainder of 480.
Put 5 as the next digit of the answer. 
Result so far: 24927.35
Subtracting 4260 from 4740 leaves us with 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4800, and continue the process.

Advancing to step 11:
If we divide 4800 by 852, we get 5 and a remainder of 540.
The number 5 becomes the next digit in our result. 
Result so far: 24927.355
Deduct 4260 from 4800 and we're left with 540.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5400, and continue the process.

Our division results in 24927.355 with a remaining 0.054.