9018308 divided by 321 
The aim is to understand the frequency of 321 in 9018308.

Moving on to step 1:
321 can be fit into 9 0 times, resulting in a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Take the next digit (0) from the dividend and append it to 9, then repeat: 90 / 321

On to step 2:
The number 321 fits into 90 0 times, leaving a remainder of 90.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 90, we get 90.
Bring next digit (1) of the dividend behind the 90 and repeat the process: 901 / 321

On to step 3:
The number 321 fits into 901 2 times, leaving a remainder of 259.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
The remainder is 259 after subtracting 642 from 901.
Append the next digit (8) from the dividend to 259 and continue with: 2598 / 321

Going ahead to step 4:
If we divide 2598 by 321, we get 8 and a remainder of 30.
Record the quotient 8 as the next digit in the result. 
Result so far: 28.0
Subtracting 2568 from 2598 leaves us with 30.
Bring next digit (3) of the dividend behind the 30 and repeat the process: 303 / 321

Step 5:
If we divide 303 by 321, we get 0 and a remainder of 303.
Use 0 as the next digit of our solution. 
Result so far: 280.0
The remainder is 303 after subtracting 0 from 303.
Append the next digit (0) from the dividend to 303 and continue with: 3030 / 321

Going ahead to step 6:
When dividing 3030 by 321, we get 9 with a remainder of 141.
Use 9 as the next digit of our solution. 
Result so far: 2809.0
If we take 2889 away from 3030, we end up with 141.
Take the next digit (8) from the dividend and append it to 141, then repeat: 1418 / 321

Let's proceed to step 7:
321 goes into 1418 4 times with a remainder of 134.
Record the quotient 4 as the next digit in the result. 
Result so far: 28094.0
Deduct 1284 from 1418 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.

Going ahead to step 8:
321 goes into 1340 4 times with a remainder of 56.
Use 4 as the next digit of our solution. 
Result so far: 28094.4
Deduct 1284 from 1340 and we're left with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

On to step 9:
560 divided by 321 is 1 with a remainder of 239.
Use 1 as the next digit of our solution. 
Result so far: 28094.41
If we take 321 away from 560, we end up with 239.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2390, and continue the process.

On to step 10:
2390 divided by 321 is 7 with a remainder of 143.
Use 7 as the next digit of our solution. 
Result so far: 28094.417
The remainder is 143 after subtracting 2247 from 2390.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1430, and continue the process.

Step 11:
321 can be fit into 1430 4 times, resulting in a remainder of 146.
Write down 4 as next digit of the result. 
Result so far: 28094.4174
Subtract 1284 from 1430 to get 146.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1460, and continue the process.

Going ahead to step 12:
When dividing 1460 by 321, we get 4 with a remainder of 176.
Use 4 as the next digit of our solution. 
Result so far: 28094.41744
Subtract 1284 from 1460 to get 176.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1760, and continue the process.

Our division results in 28094.41744 with a remaining 0.000176.