We look at the division of 38081394 by 121 
The aim is to understand the frequency of 121 in 38081394.

Step 1:
When dividing 3 by 121, we get 0 with a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Append the next digit (8) from the dividend to 3 and continue with: 38 / 121

Advancing to step 2:
121 goes into 38 0 times with a remainder of 38.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 38 to get 38.
Take the next digit (0) from the dividend and append it to 38, then repeat: 380 / 121

Going ahead to step 3:
121 can be fit into 380 3 times, resulting in a remainder of 17.
Put 3 as the next digit of the answer. 
Result so far: 3.0
Subtracting 363 from 380 leaves us with 17.
Bring next digit (8) of the dividend behind the 17 and repeat the process: 178 / 121

Advancing to step 4:
When dividing 178 by 121, we get 1 with a remainder of 57.
Record the quotient 1 as the next digit in the result. 
Result so far: 31.0
The remainder is 57 after subtracting 121 from 178.
Grab the next digit (1) from the dividend, add it to 57, then carry on: 571 / 121

Step 5:
571 divided by 121 is 4 with a remainder of 87.
Put 4 as the next digit of the answer. 
Result so far: 314.0
Subtracting 484 from 571 leaves us with 87.
Append the next digit (3) from the dividend to 87 and continue with: 873 / 121

Step 6:
The number 121 fits into 873 7 times, leaving a remainder of 26.
The next digit of our result is 7. 
Result so far: 3147.0
Deduct 847 from 873 and we're left with 26.
Bring next digit (9) of the dividend behind the 26 and repeat the process: 269 / 121

Moving on to step 7:
The number 121 fits into 269 2 times, leaving a remainder of 27.
Use 2 as the next digit of our solution. 
Result so far: 31472.0
Deduct 242 from 269 and we're left with 27.
Include the next digit (4) from the dividend after 27, then repeat: 274 / 121

Moving on to step 8:
If we divide 274 by 121, we get 2 and a remainder of 32.
Write down 2 as next digit of the result. 
Result so far: 314722.0
If we subtract 242 from 274, we get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

On to step 9:
121 goes into 320 2 times with a remainder of 78.
Use 2 as the next digit of our solution. 
Result so far: 314722.2
Deduct 242 from 320 and we're left with 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Let's proceed to step 10:
121 can be fit into 780 6 times, resulting in a remainder of 54.
Record the quotient 6 as the next digit in the result. 
Result so far: 314722.26
The remainder is 54 after subtracting 726 from 780.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Step 11:
When dividing 540 by 121, we get 4 with a remainder of 56.
The number 4 becomes the next digit in our result. 
Result so far: 314722.264
If we subtract 484 from 540, we get 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Step 12:
121 goes into 560 4 times with a remainder of 76.
Write down 4 as next digit of the result. 
Result so far: 314722.2644
Subtracting 484 from 560 leaves us with 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

The final outcome is 314722.2644, with a leftover of 0.00076.