We're dividing 838553 by 21 
Our goal is to divide 838553 by 21.

On to step 1:
The number 21 fits into 8 0 times, leaving a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Take the next digit (3) from the dividend and append it to 8, then repeat: 83 / 21

On to step 2:
If we divide 83 by 21, we get 3 and a remainder of 20.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
If we take 63 away from 83, we end up with 20.
Include the next digit (8) from the dividend after 20, then repeat: 208 / 21

Advancing to step 3:
21 can be fit into 208 9 times, resulting in a remainder of 19.
The number 9 becomes the next digit in our result. 
Result so far: 39.0
Subtracting 189 from 208 leaves us with 19.
Take the next digit (5) from the dividend and append it to 19, then repeat: 195 / 21

Advancing to step 4:
21 goes into 195 9 times with a remainder of 6.
Use 9 as the next digit of our solution. 
Result so far: 399.0
Deduct 189 from 195 and we're left with 6.
Bring next digit (5) of the dividend behind the 6 and repeat the process: 65 / 21

On to step 5:
21 can be fit into 65 3 times, resulting in a remainder of 2.
Put 3 as the next digit of the answer. 
Result so far: 3993.0
Subtract 63 from 65 to get 2.
Grab the next digit (3) from the dividend, add it to 2, then carry on: 23 / 21

On to step 6:
The number 21 fits into 23 1 times, leaving a remainder of 2.
The number 1 becomes the next digit in our result. 
Result so far: 39931.0
Subtracting 21 from 23 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 7:
21 goes into 20 0 times with a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 39931.0
If we take 0 away from 20, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 8:
When dividing 200 by 21, we get 9 with a remainder of 11.
The number 9 becomes the next digit in our result. 
Result so far: 39931.09
If we subtract 189 from 200, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Moving on to step 9:
110 divided by 21 is 5 with a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 39931.095
Subtracting 105 from 110 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 10:
When dividing 50 by 21, we get 2 with a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 39931.0952
Subtract 42 from 50 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 11:
When dividing 80 by 21, we get 3 with a remainder of 17.
Put 3 as the next digit of the answer. 
Result so far: 39931.09523
Subtract 63 from 80 to get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Moving on to step 12:
170 divided by 21 is 8 with a remainder of 2.
Use 8 as the next digit of our solution. 
Result so far: 39931.095238
The remainder is 2 after subtracting 168 from 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Advancing to step 13:
20 divided by 21 is 0 with a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 39931.095238
Deduct 0 from 20 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 14:
When dividing 200 by 21, we get 9 with a remainder of 11.
Write down 9 as next digit of the result. 
Result so far: 39931.09523809
Subtracting 189 from 200 leaves us with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

In conclusion, the division gives 39931.09523809 with a balance of 1.1e-08.