Let's divide 83807707 by 321
The aim is to understand the frequency of 321 in 83807707.

Step 1:
321 goes into 8 0 times with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Take the next digit (3) from the dividend and append it to 8, then repeat: 83 / 321

Let's proceed to step 2:
If we divide 83 by 321, we get 0 and a remainder of 83.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 83 leaves us with 83.
Append the next digit (8) from the dividend to 83 and continue with: 838 / 321

Let's proceed to step 3:
If we divide 838 by 321, we get 2 and a remainder of 196.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
If we subtract 642 from 838, we get 196.
Include the next digit (0) from the dividend after 196, then repeat: 1960 / 321

Step 4:
321 can be fit into 1960 6 times, resulting in a remainder of 34.
Use 6 as the next digit of our solution. 
Result so far: 26.0
If we subtract 1926 from 1960, we get 34.
Grab the next digit (7) from the dividend, add it to 34, then carry on: 347 / 321

Moving on to step 5:
321 can be fit into 347 1 times, resulting in a remainder of 26.
Write down 1 as next digit of the result. 
Result so far: 261.0
Subtracting 321 from 347 leaves us with 26.
Include the next digit (7) from the dividend after 26, then repeat: 267 / 321

Advancing to step 6:
321 can be fit into 267 0 times, resulting in a remainder of 267.
The next digit of our result is 0. 
Result so far: 2610.0
Subtracting 0 from 267 leaves us with 267.
Include the next digit (0) from the dividend after 267, then repeat: 2670 / 321

Step 7:
321 goes into 2670 8 times with a remainder of 102.
Put 8 as the next digit of the answer. 
Result so far: 26108.0
Subtracting 2568 from 2670 leaves us with 102.
Fetch the next digit (7) from the dividend, attach it to 102 and continue: 1027 / 321

Step 8:
1027 divided by 321 is 3 with a remainder of 64.
Put 3 as the next digit of the answer. 
Result so far: 261083.0
If we subtract 963 from 1027, we get 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

On to step 9:
If we divide 640 by 321, we get 1 and a remainder of 319.
Put 1 as the next digit of the answer. 
Result so far: 261083.1
If we take 321 away from 640, we end up with 319.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3190, and continue the process.

On to step 10:
321 goes into 3190 9 times with a remainder of 301.
The number 9 becomes the next digit in our result. 
Result so far: 261083.19
Subtracting 2889 from 3190 leaves us with 301.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3010, and continue the process.

Going ahead to step 11:
321 goes into 3010 9 times with a remainder of 121.
Use 9 as the next digit of our solution. 
Result so far: 261083.199
The remainder is 121 after subtracting 2889 from 3010.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1210, and continue the process.

The final result is 261083.199 with a remainder of 0.0121.