126273 divided by 42 
The aim is to understand the frequency of 42 in 126273.

Going ahead to step 1:
1 divided by 42 is 0 with a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Take the next digit (2) from the dividend and append it to 1, then repeat: 12 / 42

On to step 2:
42 goes into 12 0 times with a remainder of 12.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 12 to get 12.
Take the next digit (6) from the dividend and append it to 12, then repeat: 126 / 42

Step 3:
When dividing 126 by 42, we get 3 with a remainder of 0.
Use 3 as the next digit of our solution. 
Result so far: 3.0
Subtracting 126 from 126 leaves us with 0.
Take the next digit (2) from the dividend and append it to 0, then repeat: 2 / 42

Advancing to step 4:
42 can be fit into 2 0 times, resulting in a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 30.0
Subtract 0 from 2 to get 2.
Take the next digit (7) from the dividend and append it to 2, then repeat: 27 / 42

On to step 5:
42 goes into 27 0 times with a remainder of 27.
Record the quotient 0 as the next digit in the result. 
Result so far: 300.0
If we subtract 0 from 27, we get 27.
Bring next digit (3) of the dividend behind the 27 and repeat the process: 273 / 42

Step 6:
273 divided by 42 is 6 with a remainder of 21.
Use 6 as the next digit of our solution. 
Result so far: 3006.0
The remainder is 21 after subtracting 252 from 273.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Advancing to step 7:
The number 42 fits into 210 5 times, leaving a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 3006.5
If we take 210 away from 210, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 8:
42 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 3006.5
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 9:
If we divide 0 by 42, we get 0 and a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 3006.5
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 3006.5, with a leftover of 0.0.