We're dividing 813821 by 4 
Our goal is to divide 813821 by 4.

Step 1:
If we divide 8 by 4, we get 2 and a remainder of 0.
The next digit of our result is 2. 
Result so far: 2.0
If we take 8 away from 8, we end up with 0.
Append the next digit (1) from the dividend to 0 and continue with: 1 / 4

On to step 2:
4 can be fit into 1 0 times, resulting in a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 20.0
If we take 0 away from 1, we end up with 1.
Fetch the next digit (3) from the dividend, attach it to 1 and continue: 13 / 4

On to step 3:
If we divide 13 by 4, we get 3 and a remainder of 1.
Write down 3 as next digit of the result. 
Result so far: 203.0
Subtract 12 from 13 to get 1.
Fetch the next digit (8) from the dividend, attach it to 1 and continue: 18 / 4

Moving on to step 4:
18 divided by 4 is 4 with a remainder of 2.
Use 4 as the next digit of our solution. 
Result so far: 2034.0
Deduct 16 from 18 and we're left with 2.
Fetch the next digit (2) from the dividend, attach it to 2 and continue: 22 / 4

Advancing to step 5:
4 can be fit into 22 5 times, resulting in a remainder of 2.
Put 5 as the next digit of the answer. 
Result so far: 20345.0
The remainder is 2 after subtracting 20 from 22.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 4

Going ahead to step 6:
The number 4 fits into 21 5 times, leaving a remainder of 1.
The number 5 becomes the next digit in our result. 
Result so far: 203455.0
Subtracting 20 from 21 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Going ahead to step 7:
4 can be fit into 10 2 times, resulting in a remainder of 2.
Put 2 as the next digit of the answer. 
Result so far: 203455.2
Deduct 8 from 10 and we're left 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.

Let's proceed to step 8:
The number 4 fits into 20 5 times, leaving a remainder of 0.
The next digit of our result is 5. 
Result so far: 203455.25
If we subtract 20 from 20, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 9:
When dividing 0 by 4, we get 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 203455.25
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 10:
4 can be fit into 0 0 times, resulting in a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 203455.25
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 203455.25 and a remainder of 0.0.