We look at the division of 53738381 by 321 
The aim is to understand the frequency of 321 in 53738381.

Going ahead to step 1:
The number 321 fits into 5 0 times, leaving a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Take the next digit (3) from the dividend and append it to 5, then repeat: 53 / 321

Let's proceed to step 2:
When dividing 53 by 321, we get 0 with a remainder of 53.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 53, we get 53.
Grab the next digit (7) from the dividend, add it to 53, then carry on: 537 / 321

Advancing to step 3:
The number 321 fits into 537 1 times, leaving a remainder of 216.
Use 1 as the next digit of our solution. 
Result so far: 1.0
The remainder is 216 after subtracting 321 from 537.
Take the next digit (3) from the dividend and append it to 216, then repeat: 2163 / 321

Going ahead to step 4:
The number 321 fits into 2163 6 times, leaving a remainder of 237.
The number 6 becomes the next digit in our result. 
Result so far: 16.0
The remainder is 237 after subtracting 1926 from 2163.
Bring next digit (8) of the dividend behind the 237 and repeat the process: 2378 / 321

Going ahead to step 5:
When dividing 2378 by 321, we get 7 with a remainder of 131.
Put 7 as the next digit of the answer. 
Result so far: 167.0
If we subtract 2247 from 2378, we get 131.
Include the next digit (3) from the dividend after 131, then repeat: 1313 / 321

Let's proceed to step 6:
321 can be fit into 1313 4 times, resulting in a remainder of 29.
Write down 4 as next digit of the result. 
Result so far: 1674.0
If we take 1284 away from 1313, we end up with 29.
Fetch the next digit (8) from the dividend, attach it to 29 and continue: 298 / 321

Step 7:
When dividing 298 by 321, we get 0 with a remainder of 298.
Put 0 as the next digit of the answer. 
Result so far: 16740.0
If we take 0 away from 298, we end up with 298.
Fetch the next digit (1) from the dividend, attach it to 298 and continue: 2981 / 321

Let's proceed to step 8:
321 goes into 2981 9 times with a remainder of 92.
The number 9 becomes the next digit in our result. 
Result so far: 167409.0
The remainder is 92 after subtracting 2889 from 2981.
Since there are no more digits in the dividend, we add a zero to the remainder making it 920, and continue the process.

Moving on to step 9:
920 divided by 321 is 2 with a remainder of 278.
Write down 2 as next digit of the result. 
Result so far: 167409.2
Deduct 642 from 920 and we're left with 278.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2780, and continue the process.

Let's proceed to step 10:
When dividing 2780 by 321, we get 8 with a remainder of 212.
The next digit of our result is 8. 
Result so far: 167409.28
Subtracting 2568 from 2780 leaves us with 212.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2120, and continue the process.

Advancing to step 11:
321 goes into 2120 6 times with a remainder of 194.
Put 6 as the next digit of the answer. 
Result so far: 167409.286
Subtract 1926 from 2120 to get 194.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1940, and continue the process.

Advancing to step 12:
321 goes into 1940 6 times with a remainder of 14.
Write down 6 as next digit of the result. 
Result so far: 167409.2866
Subtracting 1926 from 1940 leaves us with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

The final result is 167409.2866 with a remainder of 0.00014.