We look at the division of 83838 by 21 
We want to divide 83838 by 21.

Step 1:
If we divide 8 by 21, we get 0 and a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Fetch the next digit (3) from the dividend, attach it to 8 and continue: 83 / 21

Step 2:
The number 21 fits into 83 3 times, leaving a remainder of 20.
The next digit of our result is 3. 
Result so far: 3.0
If we subtract 63 from 83, we get 20.
Include the next digit (8) from the dividend after 20, then repeat: 208 / 21

Step 3:
21 goes into 208 9 times with a remainder of 19.
The number 9 becomes the next digit in our result. 
Result so far: 39.0
If we take 189 away from 208, we end up with 19.
Include the next digit (3) from the dividend after 19, then repeat: 193 / 21

Going ahead to step 4:
21 can be fit into 193 9 times, resulting in a remainder of 4.
The number 9 becomes the next digit in our result. 
Result so far: 399.0
If we take 189 away from 193, we end up with 4.
Grab the next digit (8) from the dividend, add it to 4, then carry on: 48 / 21

Let's proceed to step 5:
When dividing 48 by 21, we get 2 with a remainder of 6.
The next digit of our result is 2. 
Result so far: 3992.0
Subtract 42 from 48 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 6:
21 can be fit into 60 2 times, resulting in a remainder of 18.
The next digit of our result is 2. 
Result so far: 3992.2
The remainder is 18 after subtracting 42 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Let's proceed to step 7:
21 goes into 180 8 times with a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 3992.28
Deduct 168 from 180 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 8:
21 can be fit into 120 5 times, resulting in a remainder of 15.
Put 5 as the next digit of the answer. 
Result so far: 3992.285
If we subtract 105 from 120, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

On to step 9:
21 goes into 150 7 times with a remainder of 3.
The next digit of our result is 7. 
Result so far: 3992.2857
Subtracting 147 from 150 leaves us with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 10:
If we divide 30 by 21, we get 1 and a remainder of 9.
The next digit of our result is 1. 
Result so far: 3992.28571
The remainder is 9 after subtracting 21 from 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Step 11:
If we divide 90 by 21, we get 4 and a remainder of 6.
The next digit of our result is 4. 
Result so far: 3992.285714
Deduct 84 from 90 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 12:
21 can be fit into 60 2 times, resulting in a remainder of 18.
Put 2 as the next digit of the answer. 
Result so far: 3992.2857142
The remainder is 18 after subtracting 42 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Going ahead to step 13:
If we divide 180 by 21, we get 8 and a remainder of 12.
Record the quotient 8 as the next digit in the result. 
Result so far: 3992.28571428
Subtract 168 from 180 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Our division results in 3992.28571428 with a remaining 1.2e-08.