Let's divide 213807 by 42
The aim is to understand the frequency of 42 in 213807.

On to step 1:
The number 42 fits into 2 0 times, leaving a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 42

Step 2:
If we divide 21 by 42, we get 0 and a remainder of 21.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 21 to get 21.
Grab the next digit (3) from the dividend, add it to 21, then carry on: 213 / 42

Let's proceed to step 3:
42 goes into 213 5 times with a remainder of 3.
The number 5 becomes the next digit in our result. 
Result so far: 5.0
Subtract 210 from 213 to get 3.
Take the next digit (8) from the dividend and append it to 3, then repeat: 38 / 42

Going ahead to step 4:
If we divide 38 by 42, we get 0 and a remainder of 38.
Use 0 as the next digit of our solution. 
Result so far: 50.0
The remainder is 38 after subtracting 0 from 38.
Take the next digit (0) from the dividend and append it to 38, then repeat: 380 / 42

Let's proceed to step 5:
The number 42 fits into 380 9 times, leaving a remainder of 2.
The number 9 becomes the next digit in our result. 
Result so far: 509.0
The remainder is 2 after subtracting 378 from 380.
Fetch the next digit (7) from the dividend, attach it to 2 and continue: 27 / 42

Moving on to step 6:
If we divide 27 by 42, we get 0 and a remainder of 27.
The next digit of our result is 0. 
Result so far: 5090.0
Subtract 0 from 27 to get 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Advancing to step 7:
The number 42 fits into 270 6 times, leaving a remainder of 18.
Write down 6 as next digit of the result. 
Result so far: 5090.6
If we take 252 away from 270, we end up 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.

On to step 8:
42 goes into 180 4 times with a remainder of 12.
Write down 4 as next digit of the result. 
Result so far: 5090.64
If we subtract 168 from 180, we 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.

Going ahead to step 9:
The number 42 fits into 120 2 times, leaving a remainder of 36.
The next digit of our result is 2. 
Result so far: 5090.642
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.

Going ahead to step 10:
When dividing 360 by 42, we get 8 with a remainder of 24.
The next digit of our result is 8. 
Result so far: 5090.6428
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 11:
42 goes into 240 5 times with a remainder of 30.
Write down 5 as next digit of the result. 
Result so far: 5090.64285
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.

On to step 12:
If we divide 300 by 42, we get 7 and a remainder of 6.
Use 7 as the next digit of our solution. 
Result so far: 5090.642857
Subtracting 294 from 300 leaves us with 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 13:
42 can be fit into 60 1 times, resulting in a remainder of 18.
The number 1 becomes the next digit in our result. 
Result so far: 5090.6428571
If we subtract 42 from 60, we get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Step 14:
180 divided by 42 is 4 with a remainder of 12.
Record the quotient 4 as the next digit in the result. 
Result so far: 5090.64285714
Subtracting 168 from 180 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

In conclusion, the division gives 5090.64285714 with a balance of 1.2e-08.