We're dividing 3943652 by 821 
We want to figure out the number of times 3943652 can be divided by 821.

Step 1:
If we divide 3 by 821, we get 0 and a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Grab the next digit (9) from the dividend, add it to 3, then carry on: 39 / 821

Let's proceed to step 2:
When dividing 39 by 821, we get 0 with a remainder of 39.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 39, we get 39.
Grab the next digit (4) from the dividend, add it to 39, then carry on: 394 / 821

Moving on to step 3:
When dividing 394 by 821, we get 0 with a remainder of 394.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 394 to get 394.
Append the next digit (3) from the dividend to 394 and continue with: 3943 / 821

Advancing to step 4:
3943 divided by 821 is 4 with a remainder of 659.
Put 4 as the next digit of the answer. 
Result so far: 4.0
If we take 3284 away from 3943, we end up with 659.
Include the next digit (6) from the dividend after 659, then repeat: 6596 / 821

Advancing to step 5:
821 goes into 6596 8 times with a remainder of 28.
Use 8 as the next digit of our solution. 
Result so far: 48.0
Subtract 6568 from 6596 to get 28.
Grab the next digit (5) from the dividend, add it to 28, then carry on: 285 / 821

Step 6:
285 divided by 821 is 0 with a remainder of 285.
The number 0 becomes the next digit in our result. 
Result so far: 480.0
The remainder is 285 after subtracting 0 from 285.
Take the next digit (2) from the dividend and append it to 285, then repeat: 2852 / 821

On to step 7:
The number 821 fits into 2852 3 times, leaving a remainder of 389.
Use 3 as the next digit of our solution. 
Result so far: 4803.0
If we take 2463 away from 2852, we end up with 389.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3890, and continue the process.

Step 8:
When dividing 3890 by 821, we get 4 with a remainder of 606.
The next digit of our result is 4. 
Result so far: 4803.4
Subtracting 3284 from 3890 leaves us with 606.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6060, and continue the process.

Advancing to step 9:
821 can be fit into 6060 7 times, resulting in a remainder of 313.
Record the quotient 7 as the next digit in the result. 
Result so far: 4803.47
Subtract 5747 from 6060 to get 313.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3130, and continue the process.

Let's proceed to step 10:
The number 821 fits into 3130 3 times, leaving a remainder of 667.
The number 3 becomes the next digit in our result. 
Result so far: 4803.473
If we subtract 2463 from 3130, we get 667.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6670, and continue the process.

On to step 11:
821 can be fit into 6670 8 times, resulting in a remainder of 102.
Use 8 as the next digit of our solution. 
Result so far: 4803.4738
Subtracting 6568 from 6670 leaves us with 102.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1020, and continue the process.

On to step 12:
821 can be fit into 1020 1 times, resulting in a remainder of 199.
Put 1 as the next digit of the answer. 
Result so far: 4803.47381
Subtract 821 from 1020 to get 199.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1990, and continue the process.

On to step 13:
The number 821 fits into 1990 2 times, leaving a remainder of 348.
Use 2 as the next digit of our solution. 
Result so far: 4803.473812
Deduct 1642 from 1990 and we're left with 348.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3480, and continue the process.

Let's proceed to step 14:
When dividing 3480 by 821, we get 4 with a remainder of 196.
Put 4 as the next digit of the answer. 
Result so far: 4803.4738124
Subtract 3284 from 3480 to get 196.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1960, and continue the process.

Let's proceed to step 15:
If we divide 1960 by 821, we get 2 and a remainder of 318.
Record the quotient 2 as the next digit in the result. 
Result so far: 4803.47381242
Deduct 1642 from 1960 and we're left with 318.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3180, and continue the process.

After the division, we end up with 4803.47381242 and a remainder of 3.18e-07.