We look at the division of 681630 by 42 
The aim is to understand the frequency of 42 in 681630.

Let's proceed to step 1:
6 divided by 42 is 0 with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Fetch the next digit (8) from the dividend, attach it to 6 and continue: 68 / 42

Moving on to step 2:
42 goes into 68 1 times with a remainder of 26.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we subtract 42 from 68, we get 26.
Take the next digit (1) from the dividend and append it to 26, then repeat: 261 / 42

Advancing to step 3:
42 goes into 261 6 times with a remainder of 9.
Write down 6 as next digit of the result. 
Result so far: 16.0
Subtract 252 from 261 to get 9.
Include the next digit (6) from the dividend after 9, then repeat: 96 / 42

On to step 4:
The number 42 fits into 96 2 times, leaving a remainder of 12.
Record the quotient 2 as the next digit in the result. 
Result so far: 162.0
Subtracting 84 from 96 leaves us with 12.
Grab the next digit (3) from the dividend, add it to 12, then carry on: 123 / 42

Let's proceed to step 5:
123 divided by 42 is 2 with a remainder of 39.
The next digit of our result is 2. 
Result so far: 1622.0
Subtracting 84 from 123 leaves us with 39.
Bring next digit (0) of the dividend behind the 39 and repeat the process: 390 / 42

Going ahead to step 6:
If we divide 390 by 42, we get 9 and a remainder of 12.
Use 9 as the next digit of our solution. 
Result so far: 16229.0
Subtract 378 from 390 to get 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 7:
120 divided by 42 is 2 with a remainder of 36.
The number 2 becomes the next digit in our result. 
Result so far: 16229.2
Subtracting 84 from 120 leaves us 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 8:
The number 42 fits into 360 8 times, leaving a remainder of 24.
The next digit of our result is 8. 
Result so far: 16229.28
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.

Moving on to step 9:
240 divided by 42 is 5 with a remainder of 30.
Record the quotient 5 as the next digit in the result. 
Result so far: 16229.285
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.

Let's proceed to step 10:
300 divided by 42 is 7 with a remainder of 6.
Write down 7 as next digit of the result. 
Result so far: 16229.2857
If we subtract 294 from 300, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 11:
If we divide 60 by 42, we get 1 and a remainder of 18.
Put 1 as the next digit of the answer. 
Result so far: 16229.28571
Deduct 42 from 60 and we're left 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 12:
180 divided by 42 is 4 with a remainder of 12.
The next digit of our result is 4. 
Result so far: 16229.285714
The remainder is 12 after subtracting 168 from 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 13:
When dividing 120 by 42, we get 2 with a remainder of 36.
Write down 2 as next digit of the result. 
Result so far: 16229.2857142
If we subtract 84 from 120, we get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Advancing to step 14:
When dividing 360 by 42, we get 8 with a remainder of 24.
The number 8 becomes the next digit in our result. 
Result so far: 16229.28571428
Subtracting 336 from 360 leaves us 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.

The final outcome is 16229.28571428, with a leftover of 2.4e-08.