12826309 divided by 321 
The aim is to understand the frequency of 321 in 12826309.

Let's proceed to step 1:
If we divide 1 by 321, we get 0 and a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Bring next digit (2) of the dividend behind the 1 and repeat the process: 12 / 321

Advancing to step 2:
The number 321 fits into 12 0 times, leaving a remainder of 12.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 12 to get 12.
Append the next digit (8) from the dividend to 12 and continue with: 128 / 321

Step 3:
When dividing 128 by 321, we get 0 with a remainder of 128.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 128 to get 128.
Fetch the next digit (2) from the dividend, attach it to 128 and continue: 1282 / 321

Advancing to step 4:
321 can be fit into 1282 3 times, resulting in a remainder of 319.
Use 3 as the next digit of our solution. 
Result so far: 3.0
If we subtract 963 from 1282, we get 319.
Include the next digit (6) from the dividend after 319, then repeat: 3196 / 321

Step 5:
If we divide 3196 by 321, we get 9 and a remainder of 307.
Write down 9 as next digit of the result. 
Result so far: 39.0
The remainder is 307 after subtracting 2889 from 3196.
Fetch the next digit (3) from the dividend, attach it to 307 and continue: 3073 / 321

Going ahead to step 6:
The number 321 fits into 3073 9 times, leaving a remainder of 184.
Record the quotient 9 as the next digit in the result. 
Result so far: 399.0
The remainder is 184 after subtracting 2889 from 3073.
Take the next digit (0) from the dividend and append it to 184, then repeat: 1840 / 321

On to step 7:
The number 321 fits into 1840 5 times, leaving a remainder of 235.
Record the quotient 5 as the next digit in the result. 
Result so far: 3995.0
If we take 1605 away from 1840, we end up with 235.
Grab the next digit (9) from the dividend, add it to 235, then carry on: 2359 / 321

Moving on to step 8:
The number 321 fits into 2359 7 times, leaving a remainder of 112.
Use 7 as the next digit of our solution. 
Result so far: 39957.0
If we subtract 2247 from 2359, we get 112.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1120, and continue the process.

Let's proceed to step 9:
321 can be fit into 1120 3 times, resulting in a remainder of 157.
The number 3 becomes the next digit in our result. 
Result so far: 39957.3
Deduct 963 from 1120 and we're left with 157.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1570, and continue the process.

On to step 10:
When dividing 1570 by 321, we get 4 with a remainder of 286.
Record the quotient 4 as the next digit in the result. 
Result so far: 39957.34
Deduct 1284 from 1570 and we're left with 286.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2860, and continue the process.

Step 11:
When dividing 2860 by 321, we get 8 with a remainder of 292.
Write down 8 as next digit of the result. 
Result so far: 39957.348
Subtract 2568 from 2860 to get 292.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2920, and continue the process.

Step 12:
When dividing 2920 by 321, we get 9 with a remainder of 31.
The number 9 becomes the next digit in our result. 
Result so far: 39957.3489
If we take 2889 away from 2920, we end up with 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Step 13:
When dividing 310 by 321, we get 0 with a remainder of 310.
Write down 0 as next digit of the result. 
Result so far: 39957.3489
If we subtract 0 from 310, we get 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3100, and continue the process.

Advancing to step 14:
321 can be fit into 3100 9 times, resulting in a remainder of 211.
Write down 9 as next digit of the result. 
Result so far: 39957.348909
Subtracting 2889 from 3100 leaves us with 211.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2110, and continue the process.

Moving on to step 15:
If we divide 2110 by 321, we get 6 and a remainder of 184.
Record the quotient 6 as the next digit in the result. 
Result so far: 39957.3489096
If we subtract 1926 from 2110, we get 184.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1840, and continue the process.

Let's proceed to step 16:
321 can be fit into 1840 5 times, resulting in a remainder of 235.
Record the quotient 5 as the next digit in the result. 
Result so far: 39957.34890965
If we subtract 1605 from 1840, we get 235.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2350, and continue the process.

The final result is 39957.34890965 with a remainder of 2.35e-07.