We look at the division of 819523 by 42 
The aim is to understand the frequency of 42 in 819523.

Step 1:
42 can be fit into 8 0 times, resulting in a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Fetch the next digit (1) from the dividend, attach it to 8 and continue: 81 / 42

Advancing to step 2:
The number 42 fits into 81 1 times, leaving a remainder of 39.
Write down 1 as next digit of the result. 
Result so far: 1.0
The remainder is 39 after subtracting 42 from 81.
Fetch the next digit (9) from the dividend, attach it to 39 and continue: 399 / 42

Advancing to step 3:
399 divided by 42 is 9 with a remainder of 21.
Record the quotient 9 as the next digit in the result. 
Result so far: 19.0
The remainder is 21 after subtracting 378 from 399.
Grab the next digit (5) from the dividend, add it to 21, then carry on: 215 / 42

Moving on to step 4:
The number 42 fits into 215 5 times, leaving a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 195.0
If we take 210 away from 215, we end up with 5.
Include the next digit (2) from the dividend after 5, then repeat: 52 / 42

Moving on to step 5:
42 can be fit into 52 1 times, resulting in a remainder of 10.
The next digit of our result is 1. 
Result so far: 1951.0
If we subtract 42 from 52, we get 10.
Grab the next digit (3) from the dividend, add it to 10, then carry on: 103 / 42

Step 6:
103 divided by 42 is 2 with a remainder of 19.
Put 2 as the next digit of the answer. 
Result so far: 19512.0
The remainder is 19 after subtracting 84 from 103.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Moving on to step 7:
190 divided by 42 is 4 with a remainder of 22.
Record the quotient 4 as the next digit in the result. 
Result so far: 19512.4
If we take 168 away from 190, we end up with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Moving on to step 8:
When dividing 220 by 42, we get 5 with a remainder of 10.
Use 5 as the next digit of our solution. 
Result so far: 19512.45
If we subtract 210 from 220, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 9:
If we divide 100 by 42, we get 2 and a remainder of 16.
Use 2 as the next digit of our solution. 
Result so far: 19512.452
Subtracting 84 from 100 leaves us with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Step 10:
The number 42 fits into 160 3 times, leaving a remainder of 34.
Write down 3 as next digit of the result. 
Result so far: 19512.4523
The remainder is 34 after subtracting 126 from 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Let's proceed to step 11:
If we divide 340 by 42, we get 8 and a remainder of 4.
Put 8 as the next digit of the answer. 
Result so far: 19512.45238
The remainder is 4 after subtracting 336 from 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 12:
40 divided by 42 is 0 with a remainder of 40.
Use 0 as the next digit of our solution. 
Result so far: 19512.45238
If we take 0 away from 40, we end up with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Step 13:
42 can be fit into 400 9 times, resulting in a remainder of 22.
Write down 9 as next digit of the result. 
Result so far: 19512.4523809
The remainder is 22 after subtracting 378 from 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Going ahead to step 14:
220 divided by 42 is 5 with a remainder of 10.
Put 5 as the next digit of the answer. 
Result so far: 19512.45238095
If we subtract 210 from 220, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Our division results in 19512.45238095 with a remaining 1e-08.