We look at the division of 660008 by 42 
The aim is to understand the frequency of 42 in 660008.

Going ahead to step 1:
The number 42 fits into 6 0 times, leaving a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Take the next digit (6) from the dividend and append it to 6, then repeat: 66 / 42

Let's proceed to step 2:
42 can be fit into 66 1 times, resulting in a remainder of 24.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtract 42 from 66 to get 24.
Include the next digit (0) from the dividend after 24, then repeat: 240 / 42

Advancing to step 3:
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: 15.0
Deduct 210 from 240 and we're left with 30.
Fetch the next digit (0) from the dividend, attach it to 30 and continue: 300 / 42

Going ahead to step 4:
The number 42 fits into 300 7 times, leaving a remainder of 6.
Record the quotient 7 as the next digit in the result. 
Result so far: 157.0
If we subtract 294 from 300, we get 6.
Fetch the next digit (0) from the dividend, attach it to 6 and continue: 60 / 42

Step 5:
The number 42 fits into 60 1 times, leaving a remainder of 18.
The next digit of our result is 1. 
Result so far: 1571.0
Subtracting 42 from 60 leaves us with 18.
Grab the next digit (8) from the dividend, add it to 18, then carry on: 188 / 42

Step 6:
When dividing 188 by 42, we get 4 with a remainder of 20.
Put 4 as the next digit of the answer. 
Result so far: 15714.0
Deduct 168 from 188 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 7:
The number 42 fits into 200 4 times, leaving a remainder of 32.
The number 4 becomes the next digit in our result. 
Result so far: 15714.4
Subtract 168 from 200 to get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

On to step 8:
320 divided by 42 is 7 with a remainder of 26.
The next digit of our result is 7. 
Result so far: 15714.47
Subtract 294 from 320 to get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Advancing to step 9:
The number 42 fits into 260 6 times, leaving a remainder of 8.
Record the quotient 6 as the next digit in the result. 
Result so far: 15714.476
The remainder is 8 after subtracting 252 from 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 10:
The number 42 fits into 80 1 times, leaving a remainder of 38.
Write down 1 as next digit of the result. 
Result so far: 15714.4761
If we subtract 42 from 80, we get 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Advancing to step 11:
When dividing 380 by 42, we get 9 with a remainder of 2.
The next digit of our result is 9. 
Result so far: 15714.47619
Subtracting 378 from 380 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 12:
20 divided by 42 is 0 with a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 15714.47619
If we take 0 away from 20, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 13:
42 goes into 200 4 times with a remainder of 32.
The number 4 becomes the next digit in our result. 
Result so far: 15714.4761904
The remainder is 32 after subtracting 168 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Advancing to step 14:
If we divide 320 by 42, we get 7 and a remainder of 26.
The next digit of our result is 7. 
Result so far: 15714.47619047
Subtracting 294 from 320 leaves us 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.

In conclusion, the division gives 15714.47619047 with a balance of 2.6e-08.