We look at the division of 63921142 by 42 
The aim is to understand the frequency of 42 in 63921142.

Advancing to step 1:
42 can be fit into 6 0 times, resulting in a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Grab the next digit (3) from the dividend, add it to 6, then carry on: 63 / 42

Let's proceed to step 2:
When dividing 63 by 42, we get 1 with a remainder of 21.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we take 42 away from 63, we end up with 21.
Include the next digit (9) from the dividend after 21, then repeat: 219 / 42

Step 3:
42 goes into 219 5 times with a remainder of 9.
Write down 5 as next digit of the result. 
Result so far: 15.0
The remainder is 9 after subtracting 210 from 219.
Grab the next digit (2) from the dividend, add it to 9, then carry on: 92 / 42

Let's proceed to step 4:
If we divide 92 by 42, we get 2 and a remainder of 8.
Record the quotient 2 as the next digit in the result. 
Result so far: 152.0
If we take 84 away from 92, we end up with 8.
Grab the next digit (1) from the dividend, add it to 8, then carry on: 81 / 42

On to step 5:
42 goes into 81 1 times with a remainder of 39.
The next digit of our result is 1. 
Result so far: 1521.0
If we take 42 away from 81, we end up with 39.
Append the next digit (1) from the dividend to 39 and continue with: 391 / 42

On to step 6:
42 goes into 391 9 times with a remainder of 13.
Record the quotient 9 as the next digit in the result. 
Result so far: 15219.0
Subtracting 378 from 391 leaves us with 13.
Fetch the next digit (4) from the dividend, attach it to 13 and continue: 134 / 42

On to step 7:
If we divide 134 by 42, we get 3 and a remainder of 8.
The number 3 becomes the next digit in our result. 
Result so far: 152193.0
If we subtract 126 from 134, we get 8.
Bring next digit (2) of the dividend behind the 8 and repeat the process: 82 / 42

Moving on to step 8:
82 divided by 42 is 1 with a remainder of 40.
Use 1 as the next digit of our solution. 
Result so far: 1521931.0
The remainder is 40 after subtracting 42 from 82.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

On to step 9:
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: 1521931.9
Subtracting 378 from 400 leaves us 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.

Step 10:
42 can be fit into 220 5 times, resulting in a remainder of 10.
The number 5 becomes the next digit in our result. 
Result so far: 1521931.95
Subtracting 210 from 220 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 11:
100 divided by 42 is 2 with a remainder of 16.
Use 2 as the next digit of our solution. 
Result so far: 1521931.952
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.

On to step 12:
The number 42 fits into 160 3 times, leaving a remainder of 34.
Record the quotient 3 as the next digit in the result. 
Result so far: 1521931.9523
If we take 126 away from 160, we end up with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

On to step 13:
340 divided by 42 is 8 with a remainder of 4.
Put 8 as the next digit of the answer. 
Result so far: 1521931.95238
Subtract 336 from 340 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 14:
The number 42 fits into 40 0 times, leaving a remainder of 40.
The number 0 becomes the next digit in our result. 
Result so far: 1521931.95238
If we subtract 0 from 40, we get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Moving on to step 15:
The number 42 fits into 400 9 times, leaving a remainder of 22.
Write down 9 as next digit of the result. 
Result so far: 1521931.9523809
If we take 378 away from 400, 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 16:
220 divided by 42 is 5 with a remainder of 10.
The number 5 becomes the next digit in our result. 
Result so far: 1521931.95238095
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 1521931.95238095 with a remaining 1e-08.