Let's divide 96515963 by 321
The aim is to understand the frequency of 321 in 96515963.

Advancing to step 1:
321 goes into 9 0 times with a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 9, we get 9.
Bring next digit (6) of the dividend behind the 9 and repeat the process: 96 / 321

Advancing to step 2:
If we divide 96 by 321, we get 0 and a remainder of 96.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 96, we end up with 96.
Fetch the next digit (5) from the dividend, attach it to 96 and continue: 965 / 321

On to step 3:
The number 321 fits into 965 3 times, leaving a remainder of 2.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
If we take 963 away from 965, we end up with 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 321

Moving on to step 4:
321 can be fit into 21 0 times, resulting in a remainder of 21.
Record the quotient 0 as the next digit in the result. 
Result so far: 30.0
Deduct 0 from 21 and we're left with 21.
Grab the next digit (5) from the dividend, add it to 21, then carry on: 215 / 321

Step 5:
When dividing 215 by 321, we get 0 with a remainder of 215.
Record the quotient 0 as the next digit in the result. 
Result so far: 300.0
If we take 0 away from 215, we end up with 215.
Include the next digit (9) from the dividend after 215, then repeat: 2159 / 321

Let's proceed to step 6:
The number 321 fits into 2159 6 times, leaving a remainder of 233.
The number 6 becomes the next digit in our result. 
Result so far: 3006.0
If we subtract 1926 from 2159, we get 233.
Append the next digit (6) from the dividend to 233 and continue with: 2336 / 321

Advancing to step 7:
When dividing 2336 by 321, we get 7 with a remainder of 89.
Use 7 as the next digit of our solution. 
Result so far: 30067.0
If we take 2247 away from 2336, we end up with 89.
Grab the next digit (3) from the dividend, add it to 89, then carry on: 893 / 321

Advancing to step 8:
If we divide 893 by 321, we get 2 and a remainder of 251.
Use 2 as the next digit of our solution. 
Result so far: 300672.0
If we subtract 642 from 893, we get 251.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2510, and continue the process.

Advancing to step 9:
321 goes into 2510 7 times with a remainder of 263.
Record the quotient 7 as the next digit in the result. 
Result so far: 300672.7
Subtracting 2247 from 2510 leaves us with 263.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2630, and continue the process.

Going ahead to step 10:
If we divide 2630 by 321, we get 8 and a remainder of 62.
Record the quotient 8 as the next digit in the result. 
Result so far: 300672.78
The remainder is 62 after subtracting 2568 from 2630.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Step 11:
If we divide 620 by 321, we get 1 and a remainder of 299.
The number 1 becomes the next digit in our result. 
Result so far: 300672.781
If we subtract 321 from 620, we get 299.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2990, and continue the process.

Moving on to step 12:
321 can be fit into 2990 9 times, resulting in a remainder of 101.
The number 9 becomes the next digit in our result. 
Result so far: 300672.7819
Deduct 2889 from 2990 and we're left with 101.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1010, and continue the process.

Let's proceed to step 13:
321 goes into 1010 3 times with a remainder of 47.
The next digit of our result is 3. 
Result so far: 300672.78193
If we subtract 963 from 1010, we get 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Moving on to step 14:
When dividing 470 by 321, we get 1 with a remainder of 149.
Put 1 as the next digit of the answer. 
Result so far: 300672.781931
If we subtract 321 from 470, we get 149.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1490, and continue the process.

On to step 15:
321 goes into 1490 4 times with a remainder of 206.
The number 4 becomes the next digit in our result. 
Result so far: 300672.7819314
The remainder is 206 after subtracting 1284 from 1490.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2060, and continue the process.

Step 16:
321 can be fit into 2060 6 times, resulting in a remainder of 134.
Put 6 as the next digit of the answer. 
Result so far: 300672.78193146
Deduct 1926 from 2060 and we're left with 134.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1340, and continue the process.

The final outcome is 300672.78193146, with a leftover of 1.34e-07.