Let's divide 51860 by 42
The aim is to understand the frequency of 42 in 51860.

Step 1:
If we divide 5 by 42, we get 0 and a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Take the next digit (1) from the dividend and append it to 5, then repeat: 51 / 42

Step 2:
51 divided by 42 is 1 with a remainder of 9.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 42 from 51 to get 9.
Fetch the next digit (8) from the dividend, attach it to 9 and continue: 98 / 42

On to step 3:
The number 42 fits into 98 2 times, leaving a remainder of 14.
The number 2 becomes the next digit in our result. 
Result so far: 12.0
Subtracting 84 from 98 leaves us with 14.
Grab the next digit (6) from the dividend, add it to 14, then carry on: 146 / 42

Advancing to step 4:
If we divide 146 by 42, we get 3 and a remainder of 20.
The next digit of our result is 3. 
Result so far: 123.0
If we take 126 away from 146, we end up with 20.
Take the next digit (0) from the dividend and append it to 20, then repeat: 200 / 42

Going ahead to step 5:
42 can be fit into 200 4 times, resulting in a remainder of 32.
The number 4 becomes the next digit in our result. 
Result so far: 1234.0
Deduct 168 from 200 and we're left with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Step 6:
42 goes into 320 7 times with a remainder of 26.
The next digit of our result is 7. 
Result so far: 1234.7
If we subtract 294 from 320, we get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Let's proceed to step 7:
If we divide 260 by 42, we get 6 and a remainder of 8.
Put 6 as the next digit of the answer. 
Result so far: 1234.76
If we subtract 252 from 260, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 8:
The number 42 fits into 80 1 times, leaving a remainder of 38.
Write down 1 as next digit of the result. 
Result so far: 1234.761
If we take 42 away from 80, we end up with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Let's proceed to step 9:
380 divided by 42 is 9 with a remainder of 2.
Use 9 as the next digit of our solution. 
Result so far: 1234.7619
Subtracting 378 from 380 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 10:
42 can be fit into 20 0 times, resulting in a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 1234.7619
Subtract 0 from 20 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 11:
200 divided by 42 is 4 with a remainder of 32.
The number 4 becomes the next digit in our result. 
Result so far: 1234.761904
The remainder is 32 after subtracting 168 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Advancing to step 12:
320 divided by 42 is 7 with a remainder of 26.
Put 7 as the next digit of the answer. 
Result so far: 1234.7619047
Deduct 294 from 320 and we're left with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

On to step 13:
42 goes into 260 6 times with a remainder of 8.
The number 6 becomes the next digit in our result. 
Result so far: 1234.76190476
If we take 252 away from 260, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

The final outcome is 1234.76190476, with a leftover of 8e-09.