We look at the division of 121013 by 42 
The aim is to understand the frequency of 42 in 121013.

Advancing to step 1:
If we divide 1 by 42, we get 0 and a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Bring next digit (2) of the dividend behind the 1 and repeat the process: 12 / 42

Moving on to step 2:
The number 42 fits into 12 0 times, leaving a remainder of 12.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 12 leaves us with 12.
Take the next digit (1) from the dividend and append it to 12, then repeat: 121 / 42

On to step 3:
When dividing 121 by 42, we get 2 with a remainder of 37.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Subtract 84 from 121 to get 37.
Include the next digit (0) from the dividend after 37, then repeat: 370 / 42

Advancing to step 4:
The number 42 fits into 370 8 times, leaving a remainder of 34.
Record the quotient 8 as the next digit in the result. 
Result so far: 28.0
Deduct 336 from 370 and we're left with 34.
Grab the next digit (1) from the dividend, add it to 34, then carry on: 341 / 42

Going ahead to step 5:
341 divided by 42 is 8 with a remainder of 5.
The number 8 becomes the next digit in our result. 
Result so far: 288.0
If we subtract 336 from 341, we get 5.
Bring next digit (3) of the dividend behind the 5 and repeat the process: 53 / 42

Step 6:
42 goes into 53 1 times with a remainder of 11.
Put 1 as the next digit of the answer. 
Result so far: 2881.0
Subtract 42 from 53 to get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Let's proceed to step 7:
42 goes into 110 2 times with a remainder of 26.
Record the quotient 2 as the next digit in the result. 
Result so far: 2881.2
Deduct 84 from 110 and we're left with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Moving on to step 8:
The number 42 fits into 260 6 times, leaving a remainder of 8.
Write down 6 as next digit of the result. 
Result so far: 2881.26
Deduct 252 from 260 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 9:
When dividing 80 by 42, we get 1 with a remainder of 38.
The number 1 becomes the next digit in our result. 
Result so far: 2881.261
If we take 42 away from 80, we end up with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Step 10:
When dividing 380 by 42, we get 9 with a remainder of 2.
Use 9 as the next digit of our solution. 
Result so far: 2881.2619
If we subtract 378 from 380, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 11:
42 goes into 20 0 times with a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 2881.2619
The remainder is 20 after subtracting 0 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 12:
If we divide 200 by 42, we get 4 and a remainder of 32.
Use 4 as the next digit of our solution. 
Result so far: 2881.261904
Subtracting 168 from 200 leaves us with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Moving on to step 13:
320 divided by 42 is 7 with a remainder of 26.
Write down 7 as next digit of the result. 
Result so far: 2881.2619047
The remainder is 26 after subtracting 294 from 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

On to step 14:
When dividing 260 by 42, we get 6 with a remainder of 8.
Put 6 as the next digit of the answer. 
Result so far: 2881.26190476
Subtract 252 from 260 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

The final outcome is 2881.26190476, with a leftover of 8e-09.