We look at the division of 39576907 by 821 
The aim is to understand the frequency of 821 in 39576907.

Let's proceed to step 1:
If we divide 3 by 821, we get 0 and a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Append the next digit (9) from the dividend to 3 and continue with: 39 / 821

On to step 2:
When dividing 39 by 821, we get 0 with a remainder of 39.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 39 leaves us with 39.
Bring next digit (5) of the dividend behind the 39 and repeat the process: 395 / 821

Let's proceed to step 3:
The number 821 fits into 395 0 times, leaving a remainder of 395.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 395, we get 395.
Take the next digit (7) from the dividend and append it to 395, then repeat: 3957 / 821

Going ahead to step 4:
If we divide 3957 by 821, we get 4 and a remainder of 673.
Write down 4 as next digit of the result. 
Result so far: 4.0
Deduct 3284 from 3957 and we're left with 673.
Take the next digit (6) from the dividend and append it to 673, then repeat: 6736 / 821

On to step 5:
When dividing 6736 by 821, we get 8 with a remainder of 168.
The next digit of our result is 8. 
Result so far: 48.0
If we subtract 6568 from 6736, we get 168.
Grab the next digit (9) from the dividend, add it to 168, then carry on: 1689 / 821

Let's proceed to step 6:
The number 821 fits into 1689 2 times, leaving a remainder of 47.
The number 2 becomes the next digit in our result. 
Result so far: 482.0
Deduct 1642 from 1689 and we're left with 47.
Bring next digit (0) of the dividend behind the 47 and repeat the process: 470 / 821

On to step 7:
If we divide 470 by 821, we get 0 and a remainder of 470.
Put 0 as the next digit of the answer. 
Result so far: 4820.0
Deduct 0 from 470 and we're left with 470.
Include the next digit (7) from the dividend after 470, then repeat: 4707 / 821

Let's proceed to step 8:
821 goes into 4707 5 times with a remainder of 602.
Put 5 as the next digit of the answer. 
Result so far: 48205.0
If we take 4105 away from 4707, we end up with 602.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6020, and continue the process.

Step 9:
6020 divided by 821 is 7 with a remainder of 273.
The number 7 becomes the next digit in our result. 
Result so far: 48205.7
If we take 5747 away from 6020, we end up with 273.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2730, and continue the process.

On to step 10:
2730 divided by 821 is 3 with a remainder of 267.
The number 3 becomes the next digit in our result. 
Result so far: 48205.73
Subtracting 2463 from 2730 leaves us with 267.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2670, and continue the process.

Going ahead to step 11:
The number 821 fits into 2670 3 times, leaving a remainder of 207.
The number 3 becomes the next digit in our result. 
Result so far: 48205.733
Deduct 2463 from 2670 and we're left with 207.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2070, and continue the process.

The final result is 48205.733 with a remainder of 0.0207.