852909 divided by 42 
The aim is to understand the frequency of 42 in 852909.

Moving on to step 1:
When dividing 8 by 42, we get 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Bring next digit (5) of the dividend behind the 8 and repeat the process: 85 / 42

Moving on to step 2:
42 can be fit into 85 2 times, resulting in a remainder of 1.
The next digit of our result is 2. 
Result so far: 2.0
If we take 84 away from 85, we end up with 1.
Take the next digit (2) from the dividend and append it to 1, then repeat: 12 / 42

On to step 3:
42 goes into 12 0 times with a remainder of 12.
The number 0 becomes the next digit in our result. 
Result so far: 20.0
Deduct 0 from 12 and we're left with 12.
Append the next digit (9) from the dividend to 12 and continue with: 129 / 42

Going ahead to step 4:
If we divide 129 by 42, we get 3 and a remainder of 3.
The number 3 becomes the next digit in our result. 
Result so far: 203.0
If we subtract 126 from 129, we get 3.
Grab the next digit (0) from the dividend, add it to 3, then carry on: 30 / 42

Step 5:
If we divide 30 by 42, we get 0 and a remainder of 30.
The number 0 becomes the next digit in our result. 
Result so far: 2030.0
If we take 0 away from 30, we end up with 30.
Append the next digit (9) from the dividend to 30 and continue with: 309 / 42

On to step 6:
If we divide 309 by 42, we get 7 and a remainder of 15.
The number 7 becomes the next digit in our result. 
Result so far: 20307.0
Subtracting 294 from 309 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 7:
If we divide 150 by 42, we get 3 and a remainder of 24.
Use 3 as the next digit of our solution. 
Result so far: 20307.3
Subtract 126 from 150 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.

Step 8:
240 divided by 42 is 5 with a remainder of 30.
Write down 5 as next digit of the result. 
Result so far: 20307.35
Deduct 210 from 240 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 9:
If we divide 300 by 42, we get 7 and a remainder of 6.
The number 7 becomes the next digit in our result. 
Result so far: 20307.357
Subtracting 294 from 300 leaves us 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.

Going ahead to step 10:
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: 20307.3571
Subtracting 42 from 60 leaves us with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Going ahead to step 11:
180 divided by 42 is 4 with a remainder of 12.
Write down 4 as next digit of the result. 
Result so far: 20307.35714
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.

Let's proceed to step 12:
42 can be fit into 120 2 times, resulting in a remainder of 36.
Write down 2 as next digit of the result. 
Result so far: 20307.357142
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.

On to step 13:
42 goes into 360 8 times with a remainder of 24.
Record the quotient 8 as the next digit in the result. 
Result so far: 20307.3571428
Deduct 336 from 360 and we're left with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Moving on to step 14:
42 goes into 240 5 times with a remainder of 30.
Put 5 as the next digit of the answer. 
Result so far: 20307.35714285
If we take 210 away from 240, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

The final result is 20307.35714285 with a remainder of 3e-08.