We're dividing 29521387 by 121 
The aim is to understand the frequency of 121 in 29521387.

Let's proceed to step 1:
The number 121 fits into 2 0 times, leaving a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Take the next digit (9) from the dividend and append it to 2, then repeat: 29 / 121

Let's proceed to step 2:
29 divided by 121 is 0 with a remainder of 29.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 29 after subtracting 0 from 29.
Bring next digit (5) of the dividend behind the 29 and repeat the process: 295 / 121

Advancing to step 3:
When dividing 295 by 121, we get 2 with a remainder of 53.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Deduct 242 from 295 and we're left with 53.
Include the next digit (2) from the dividend after 53, then repeat: 532 / 121

Going ahead to step 4:
121 can be fit into 532 4 times, resulting in a remainder of 48.
Use 4 as the next digit of our solution. 
Result so far: 24.0
Subtract 484 from 532 to get 48.
Fetch the next digit (1) from the dividend, attach it to 48 and continue: 481 / 121

Let's proceed to step 5:
If we divide 481 by 121, we get 3 and a remainder of 118.
Write down 3 as next digit of the result. 
Result so far: 243.0
If we subtract 363 from 481, we get 118.
Include the next digit (3) from the dividend after 118, then repeat: 1183 / 121

Step 6:
121 goes into 1183 9 times with a remainder of 94.
The number 9 becomes the next digit in our result. 
Result so far: 2439.0
The remainder is 94 after subtracting 1089 from 1183.
Take the next digit (8) from the dividend and append it to 94, then repeat: 948 / 121

Moving on to step 7:
The number 121 fits into 948 7 times, leaving a remainder of 101.
The number 7 becomes the next digit in our result. 
Result so far: 24397.0
If we subtract 847 from 948, we get 101.
Include the next digit (7) from the dividend after 101, then repeat: 1017 / 121

Step 8:
If we divide 1017 by 121, we get 8 and a remainder of 49.
Write down 8 as next digit of the result. 
Result so far: 243978.0
Subtracting 968 from 1017 leaves us with 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Let's proceed to step 9:
If we divide 490 by 121, we get 4 and a remainder of 6.
The number 4 becomes the next digit in our result. 
Result so far: 243978.4
Subtracting 484 from 490 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 10:
121 goes into 60 0 times with a remainder of 60.
The number 0 becomes the next digit in our result. 
Result so far: 243978.4
Subtract 0 from 60 to get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Going ahead to step 11:
121 goes into 600 4 times with a remainder of 116.
Record the quotient 4 as the next digit in the result. 
Result so far: 243978.404
Subtracting 484 from 600 leaves us with 116.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1160, and continue the process.

Let's proceed to step 12:
1160 divided by 121 is 9 with a remainder of 71.
Record the quotient 9 as the next digit in the result. 
Result so far: 243978.4049
Subtract 1089 from 1160 to get 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Moving on to step 13:
710 divided by 121 is 5 with a remainder of 105.
Use 5 as the next digit of our solution. 
Result so far: 243978.40495
Deduct 605 from 710 and we're left with 105.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1050, and continue the process.

Step 14:
121 can be fit into 1050 8 times, resulting in a remainder of 82.
The number 8 becomes the next digit in our result. 
Result so far: 243978.404958
Subtract 968 from 1050 to get 82.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

On to step 15:
The number 121 fits into 820 6 times, leaving a remainder of 94.
Write down 6 as next digit of the result. 
Result so far: 243978.4049586
If we take 726 away from 820, we end up with 94.
Since there are no more digits in the dividend, we add a zero to the remainder making it 940, and continue the process.

Advancing to step 16:
121 can be fit into 940 7 times, resulting in a remainder of 93.
The number 7 becomes the next digit in our result. 
Result so far: 243978.40495867
Deduct 847 from 940 and we're left with 93.
Since there are no more digits in the dividend, we add a zero to the remainder making it 930, and continue the process.

The final result is 243978.40495867 with a remainder of 9.3e-08.