We're dividing 659916 by 42 
The aim is to understand the frequency of 42 in 659916.

Advancing to step 1:
When dividing 6 by 42, we get 0 with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Fetch the next digit (5) from the dividend, attach it to 6 and continue: 65 / 42

Moving on to step 2:
When dividing 65 by 42, we get 1 with a remainder of 23.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 42 from 65 to get 23.
Bring next digit (9) of the dividend behind the 23 and repeat the process: 239 / 42

Advancing to step 3:
When dividing 239 by 42, we get 5 with a remainder of 29.
Put 5 as the next digit of the answer. 
Result so far: 15.0
Deduct 210 from 239 and we're left with 29.
Grab the next digit (9) from the dividend, add it to 29, then carry on: 299 / 42

Let's proceed to step 4:
When dividing 299 by 42, we get 7 with a remainder of 5.
The next digit of our result is 7. 
Result so far: 157.0
If we take 294 away from 299, we end up with 5.
Include the next digit (1) from the dividend after 5, then repeat: 51 / 42

Going ahead to step 5:
42 can be fit into 51 1 times, resulting in a remainder of 9.
Use 1 as the next digit of our solution. 
Result so far: 1571.0
Subtracting 42 from 51 leaves us with 9.
Bring next digit (6) of the dividend behind the 9 and repeat the process: 96 / 42

Moving on to step 6:
If we divide 96 by 42, we get 2 and a remainder of 12.
Write down 2 as next digit of the result. 
Result so far: 15712.0
The remainder is 12 after subtracting 84 from 96.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Let's proceed to step 7:
42 can be fit into 120 2 times, resulting in a remainder of 36.
The number 2 becomes the next digit in our result. 
Result so far: 15712.2
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.

Let's proceed to step 8:
42 goes into 360 8 times with a remainder of 24.
Use 8 as the next digit of our solution. 
Result so far: 15712.28
The remainder is 24 after subtracting 336 from 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Step 9:
If we divide 240 by 42, we get 5 and a remainder of 30.
The next digit of our result is 5. 
Result so far: 15712.285
The remainder is 30 after subtracting 210 from 240.
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:
The number 42 fits into 300 7 times, leaving a remainder of 6.
Use 7 as the next digit of our solution. 
Result so far: 15712.2857
Deduct 294 from 300 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 11:
60 divided by 42 is 1 with a remainder of 18.
Record the quotient 1 as the next digit in the result. 
Result so far: 15712.28571
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.

Let's proceed to step 12:
42 can be fit into 180 4 times, resulting in a remainder of 12.
Record the quotient 4 as the next digit in the result. 
Result so far: 15712.285714
Subtracting 168 from 180 leaves us 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.

Advancing to step 13:
The number 42 fits into 120 2 times, leaving a remainder of 36.
The number 2 becomes the next digit in our result. 
Result so far: 15712.2857142
Deduct 84 from 120 and we're left 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.

Let's proceed to step 14:
42 can be fit into 360 8 times, resulting in a remainder of 24.
The number 8 becomes the next digit in our result. 
Result so far: 15712.28571428
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.

Our division results in 15712.28571428 with a remaining 2.4e-08.