We're dividing 69280069 by 321 
The aim is to understand the frequency of 321 in 69280069.

Advancing to step 1:
When dividing 6 by 321, we get 0 with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Bring next digit (9) of the dividend behind the 6 and repeat the process: 69 / 321

Going ahead to step 2:
321 goes into 69 0 times with a remainder of 69.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 69 after subtracting 0 from 69.
Take the next digit (2) from the dividend and append it to 69, then repeat: 692 / 321

Step 3:
321 can be fit into 692 2 times, resulting in a remainder of 50.
Write down 2 as next digit of the result. 
Result so far: 2.0
Subtract 642 from 692 to get 50.
Bring next digit (8) of the dividend behind the 50 and repeat the process: 508 / 321

Step 4:
The number 321 fits into 508 1 times, leaving a remainder of 187.
Use 1 as the next digit of our solution. 
Result so far: 21.0
Subtract 321 from 508 to get 187.
Grab the next digit (0) from the dividend, add it to 187, then carry on: 1870 / 321

Advancing to step 5:
1870 divided by 321 is 5 with a remainder of 265.
Put 5 as the next digit of the answer. 
Result so far: 215.0
If we subtract 1605 from 1870, we get 265.
Include the next digit (0) from the dividend after 265, then repeat: 2650 / 321

Going ahead to step 6:
321 goes into 2650 8 times with a remainder of 82.
The number 8 becomes the next digit in our result. 
Result so far: 2158.0
Subtracting 2568 from 2650 leaves us with 82.
Grab the next digit (6) from the dividend, add it to 82, then carry on: 826 / 321

On to step 7:
When dividing 826 by 321, we get 2 with a remainder of 184.
Use 2 as the next digit of our solution. 
Result so far: 21582.0
If we subtract 642 from 826, we get 184.
Bring next digit (9) of the dividend behind the 184 and repeat the process: 1849 / 321

Moving on to step 8:
321 can be fit into 1849 5 times, resulting in a remainder of 244.
Write down 5 as next digit of the result. 
Result so far: 215825.0
Subtracting 1605 from 1849 leaves us with 244.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2440, and continue the process.

Step 9:
If we divide 2440 by 321, we get 7 and a remainder of 193.
Use 7 as the next digit of our solution. 
Result so far: 215825.7
Subtracting 2247 from 2440 leaves us with 193.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1930, and continue the process.

Going ahead to step 10:
321 goes into 1930 6 times with a remainder of 4.
Use 6 as the next digit of our solution. 
Result so far: 215825.76
If we subtract 1926 from 1930, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 11:
321 can be fit into 40 0 times, resulting in a remainder of 40.
The next digit of our result is 0. 
Result so far: 215825.76
Subtract 0 from 40 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Advancing to step 12:
When dividing 400 by 321, we get 1 with a remainder of 79.
The next digit of our result is 1. 
Result so far: 215825.7601
Deduct 321 from 400 and we're left with 79.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

Going ahead to step 13:
When dividing 790 by 321, we get 2 with a remainder of 148.
The next digit of our result is 2. 
Result so far: 215825.76012
Subtract 642 from 790 to get 148.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1480, and continue the process.

Step 14:
If we divide 1480 by 321, we get 4 and a remainder of 196.
The next digit of our result is 4. 
Result so far: 215825.760124
If we subtract 1284 from 1480, we 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.

Advancing to step 15:
321 goes into 1960 6 times with a remainder of 34.
Record the quotient 6 as the next digit in the result. 
Result so far: 215825.7601246
Deduct 1926 from 1960 and we're left with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Moving on to step 16:
321 can be fit into 340 1 times, resulting in a remainder of 19.
The next digit of our result is 1. 
Result so far: 215825.76012461
Deduct 321 from 340 and we're left with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

After the division, we end up with 215825.76012461 and a remainder of 1.9e-08.