We're dividing 921715 by 42 
The aim is to understand the frequency of 42 in 921715.

Step 1:
The number 42 fits into 9 0 times, leaving a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 9, we end up with 9.
Append the next digit (2) from the dividend to 9 and continue with: 92 / 42

Let's proceed to step 2:
If we divide 92 by 42, we get 2 and a remainder of 8.
The next digit of our result is 2. 
Result so far: 2.0
The remainder is 8 after subtracting 84 from 92.
Append the next digit (1) from the dividend to 8 and continue with: 81 / 42

Step 3:
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: 21.0
Deduct 42 from 81 and we're left with 39.
Append the next digit (7) from the dividend to 39 and continue with: 397 / 42

On to step 4:
42 goes into 397 9 times with a remainder of 19.
The next digit of our result is 9. 
Result so far: 219.0
Deduct 378 from 397 and we're left with 19.
Take the next digit (1) from the dividend and append it to 19, then repeat: 191 / 42

Let's proceed to step 5:
42 goes into 191 4 times with a remainder of 23.
Write down 4 as next digit of the result. 
Result so far: 2194.0
If we subtract 168 from 191, we get 23.
Grab the next digit (5) from the dividend, add it to 23, then carry on: 235 / 42

Going ahead to step 6:
235 divided by 42 is 5 with a remainder of 25.
Record the quotient 5 as the next digit in the result. 
Result so far: 21945.0
If we subtract 210 from 235, we get 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Advancing to step 7:
42 can be fit into 250 5 times, resulting in a remainder of 40.
Record the quotient 5 as the next digit in the result. 
Result so far: 21945.5
Deduct 210 from 250 and we're left 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.

Going ahead to step 8:
400 divided by 42 is 9 with a remainder of 22.
Use 9 as the next digit of our solution. 
Result so far: 21945.59
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.

Let's proceed to step 9:
42 goes into 220 5 times with a remainder of 10.
Record the quotient 5 as the next digit in the result. 
Result so far: 21945.595
If we take 210 away from 220, we end up 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.

Moving on to step 10:
When dividing 100 by 42, we get 2 with a remainder of 16.
Record the quotient 2 as the next digit in the result. 
Result so far: 21945.5952
If we subtract 84 from 100, we get 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 11:
42 goes into 160 3 times with a remainder of 34.
Record the quotient 3 as the next digit in the result. 
Result so far: 21945.59523
Subtract 126 from 160 to get 34.
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 12:
340 divided by 42 is 8 with a remainder of 4.
Use 8 as the next digit of our solution. 
Result so far: 21945.595238
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.

Advancing to step 13:
If we divide 40 by 42, we get 0 and a remainder of 40.
The number 0 becomes the next digit in our result. 
Result so far: 21945.595238
Subtracting 0 from 40 leaves us 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.

Let's proceed to step 14:
42 goes into 400 9 times with a remainder of 22.
Put 9 as the next digit of the answer. 
Result so far: 21945.59523809
Deduct 378 from 400 and we're left 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.

The final result is 21945.59523809 with a remainder of 2.2e-08.