We look at the division of 666195 by 42 
The aim is to understand the frequency of 42 in 666195.

Moving on to step 1:
The number 42 fits into 6 0 times, leaving a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Grab the next digit (6) from the dividend, add it to 6, then carry on: 66 / 42

On to step 2:
42 can be fit into 66 1 times, resulting in a remainder of 24.
Use 1 as the next digit of our solution. 
Result so far: 1.0
The remainder is 24 after subtracting 42 from 66.
Bring next digit (6) of the dividend behind the 24 and repeat the process: 246 / 42

Step 3:
The number 42 fits into 246 5 times, leaving a remainder of 36.
The number 5 becomes the next digit in our result. 
Result so far: 15.0
Subtracting 210 from 246 leaves us with 36.
Bring next digit (1) of the dividend behind the 36 and repeat the process: 361 / 42

Going ahead to step 4:
42 can be fit into 361 8 times, resulting in a remainder of 25.
Write down 8 as next digit of the result. 
Result so far: 158.0
Subtract 336 from 361 to get 25.
Append the next digit (9) from the dividend to 25 and continue with: 259 / 42

Advancing to step 5:
When dividing 259 by 42, we get 6 with a remainder of 7.
Put 6 as the next digit of the answer. 
Result so far: 1586.0
If we take 252 away from 259, we end up with 7.
Bring next digit (5) of the dividend behind the 7 and repeat the process: 75 / 42

On to step 6:
42 can be fit into 75 1 times, resulting in a remainder of 33.
Put 1 as the next digit of the answer. 
Result so far: 15861.0
The remainder is 33 after subtracting 42 from 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

On to step 7:
If we divide 330 by 42, we get 7 and a remainder of 36.
The next digit of our result is 7. 
Result so far: 15861.7
If we subtract 294 from 330, we get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Let's proceed to step 8:
42 can be fit into 360 8 times, resulting in a remainder of 24.
The next digit of our result is 8. 
Result so far: 15861.78
If we subtract 336 from 360, we get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Going ahead to step 9:
When dividing 240 by 42, we get 5 with a remainder of 30.
Use 5 as the next digit of our solution. 
Result so far: 15861.785
If we subtract 210 from 240, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Advancing to step 10:
When dividing 300 by 42, we get 7 with a remainder of 6.
Use 7 as the next digit of our solution. 
Result so far: 15861.7857
If we subtract 294 from 300, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Step 11:
60 divided by 42 is 1 with a remainder of 18.
The number 1 becomes the next digit in our result. 
Result so far: 15861.78571
If we subtract 42 from 60, we get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Advancing to step 12:
When dividing 180 by 42, we get 4 with a remainder of 12.
Write down 4 as next digit of the result. 
Result so far: 15861.785714
Deduct 168 from 180 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Going ahead to step 13:
42 goes into 120 2 times with a remainder of 36.
Write down 2 as next digit of the result. 
Result so far: 15861.7857142
If we take 84 away from 120, we end up with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Moving on to step 14:
When dividing 360 by 42, we get 8 with a remainder of 24.
Record the quotient 8 as the next digit in the result. 
Result so far: 15861.78571428
Subtract 336 from 360 to get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

After the division, we end up with 15861.78571428 and a remainder of 2.4e-08.