We look at the division of 68484399 by 321 
The aim is to understand the frequency of 321 in 68484399.

Step 1:
The number 321 fits into 6 0 times, leaving a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Bring next digit (8) of the dividend behind the 6 and repeat the process: 68 / 321

On to step 2:
321 goes into 68 0 times with a remainder of 68.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 68, we get 68.
Grab the next digit (4) from the dividend, add it to 68, then carry on: 684 / 321

Going ahead to step 3:
684 divided by 321 is 2 with a remainder of 42.
The next digit of our result is 2. 
Result so far: 2.0
The remainder is 42 after subtracting 642 from 684.
Bring next digit (8) of the dividend behind the 42 and repeat the process: 428 / 321

On to step 4:
If we divide 428 by 321, we get 1 and a remainder of 107.
Write down 1 as next digit of the result. 
Result so far: 21.0
If we subtract 321 from 428, we get 107.
Include the next digit (4) from the dividend after 107, then repeat: 1074 / 321

Step 5:
321 goes into 1074 3 times with a remainder of 111.
The number 3 becomes the next digit in our result. 
Result so far: 213.0
If we take 963 away from 1074, we end up with 111.
Include the next digit (3) from the dividend after 111, then repeat: 1113 / 321

Moving on to step 6:
1113 divided by 321 is 3 with a remainder of 150.
Write down 3 as next digit of the result. 
Result so far: 2133.0
Subtracting 963 from 1113 leaves us with 150.
Append the next digit (9) from the dividend to 150 and continue with: 1509 / 321

Let's proceed to step 7:
If we divide 1509 by 321, we get 4 and a remainder of 225.
The next digit of our result is 4. 
Result so far: 21334.0
If we subtract 1284 from 1509, we get 225.
Append the next digit (9) from the dividend to 225 and continue with: 2259 / 321

Going ahead to step 8:
When dividing 2259 by 321, we get 7 with a remainder of 12.
Record the quotient 7 as the next digit in the result. 
Result so far: 213347.0
Subtract 2247 from 2259 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Moving on to step 9:
120 divided by 321 is 0 with a remainder of 120.
Use 0 as the next digit of our solution. 
Result so far: 213347.0
If we take 0 away from 120, we end up with 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

On to step 10:
When dividing 1200 by 321, we get 3 with a remainder of 237.
Use 3 as the next digit of our solution. 
Result so far: 213347.03
Deduct 963 from 1200 and we're left with 237.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2370, and continue the process.

Moving on to step 11:
321 can be fit into 2370 7 times, resulting in a remainder of 123.
Write down 7 as next digit of the result. 
Result so far: 213347.037
If we subtract 2247 from 2370, we get 123.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1230, and continue the process.

On to step 12:
When dividing 1230 by 321, we get 3 with a remainder of 267.
The number 3 becomes the next digit in our result. 
Result so far: 213347.0373
If we subtract 963 from 1230, we get 267.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2670, and continue the process.

Moving on to step 13:
When dividing 2670 by 321, we get 8 with a remainder of 102.
The number 8 becomes the next digit in our result. 
Result so far: 213347.03738
Subtract 2568 from 2670 to get 102.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1020, and continue the process.

Advancing to step 14:
When dividing 1020 by 321, we get 3 with a remainder of 57.
The number 3 becomes the next digit in our result. 
Result so far: 213347.037383
Subtract 963 from 1020 to get 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

On to step 15:
The number 321 fits into 570 1 times, leaving a remainder of 249.
Use 1 as the next digit of our solution. 
Result so far: 213347.0373831
Subtracting 321 from 570 leaves us with 249.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2490, and continue the process.

Let's proceed to step 16:
When dividing 2490 by 321, we get 7 with a remainder of 243.
The number 7 becomes the next digit in our result. 
Result so far: 213347.03738317
If we subtract 2247 from 2490, we get 243.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2430, and continue the process.

Our division results in 213347.03738317 with a remaining 2.43e-07.