We look at the division of 75035058 by 121 
The aim is to understand the frequency of 121 in 75035058.

On to step 1:
The number 121 fits into 7 0 times, leaving a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Append the next digit (5) from the dividend to 7 and continue with: 75 / 121

Let's proceed to step 2:
The number 121 fits into 75 0 times, leaving a remainder of 75.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 75 to get 75.
Bring next digit (0) of the dividend behind the 75 and repeat the process: 750 / 121

Moving on to step 3:
If we divide 750 by 121, we get 6 and a remainder of 24.
The next digit of our result is 6. 
Result so far: 6.0
Subtracting 726 from 750 leaves us with 24.
Include the next digit (3) from the dividend after 24, then repeat: 243 / 121

On to step 4:
When dividing 243 by 121, we get 2 with a remainder of 1.
The next digit of our result is 2. 
Result so far: 62.0
Subtracting 242 from 243 leaves us with 1.
Grab the next digit (5) from the dividend, add it to 1, then carry on: 15 / 121

Going ahead to step 5:
If we divide 15 by 121, we get 0 and a remainder of 15.
Put 0 as the next digit of the answer. 
Result so far: 620.0
If we subtract 0 from 15, we get 15.
Bring next digit (0) of the dividend behind the 15 and repeat the process: 150 / 121

On to step 6:
The number 121 fits into 150 1 times, leaving a remainder of 29.
The next digit of our result is 1. 
Result so far: 6201.0
Deduct 121 from 150 and we're left with 29.
Include the next digit (5) from the dividend after 29, then repeat: 295 / 121

Advancing to step 7:
If we divide 295 by 121, we get 2 and a remainder of 53.
Write down 2 as next digit of the result. 
Result so far: 62012.0
Subtracting 242 from 295 leaves us with 53.
Grab the next digit (8) from the dividend, add it to 53, then carry on: 538 / 121

On to step 8:
The number 121 fits into 538 4 times, leaving a remainder of 54.
Record the quotient 4 as the next digit in the result. 
Result so far: 620124.0
If we take 484 away from 538, we end up with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Step 9:
121 can be fit into 540 4 times, resulting in a remainder of 56.
The number 4 becomes the next digit in our result. 
Result so far: 620124.4
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.

On to step 10:
If we divide 560 by 121, we get 4 and a remainder of 76.
Put 4 as the next digit of the answer. 
Result so far: 620124.44
Subtract 484 from 560 to get 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

After the division, we end up with 620124.44 and a remainder of 0.076.