We look at the division of 155573 by 42 
The aim is to understand the frequency of 42 in 155573.

Step 1:
1 divided by 42 is 0 with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Fetch the next digit (5) from the dividend, attach it to 1 and continue: 15 / 42

Moving on to step 2:
If we divide 15 by 42, we get 0 and a remainder of 15.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 15, we get 15.
Include the next digit (5) from the dividend after 15, then repeat: 155 / 42

Let's proceed to step 3:
If we divide 155 by 42, we get 3 and a remainder of 29.
Write down 3 as next digit of the result. 
Result so far: 3.0
Subtract 126 from 155 to get 29.
Fetch the next digit (5) from the dividend, attach it to 29 and continue: 295 / 42

On to step 4:
42 goes into 295 7 times with a remainder of 1.
Write down 7 as next digit of the result. 
Result so far: 37.0
If we subtract 294 from 295, we get 1.
Grab the next digit (7) from the dividend, add it to 1, then carry on: 17 / 42

On to step 5:
If we divide 17 by 42, we get 0 and a remainder of 17.
The number 0 becomes the next digit in our result. 
Result so far: 370.0
Deduct 0 from 17 and we're left with 17.
Take the next digit (3) from the dividend and append it to 17, then repeat: 173 / 42

Advancing to step 6:
The number 42 fits into 173 4 times, leaving a remainder of 5.
The next digit of our result is 4. 
Result so far: 3704.0
If we take 168 away from 173, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Moving on to step 7:
The number 42 fits into 50 1 times, leaving a remainder of 8.
The number 1 becomes the next digit in our result. 
Result so far: 3704.1
If we subtract 42 from 50, we 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.

Step 8:
80 divided by 42 is 1 with a remainder of 38.
Use 1 as the next digit of our solution. 
Result so far: 3704.11
Subtracting 42 from 80 leaves us 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.

Our division results in 3704.11 with a remaining 0.038.