We look at the division of 520120 by 14 
The aim is to understand the frequency of 14 in 520120.

On to step 1:
5 divided by 14 is 0 with a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Bring next digit (2) of the dividend behind the 5 and repeat the process: 52 / 14

Moving on to step 2:
When dividing 52 by 14, we get 3 with a remainder of 10.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
Subtract 42 from 52 to get 10.
Take the next digit (0) from the dividend and append it to 10, then repeat: 100 / 14

Advancing to step 3:
14 goes into 100 7 times with a remainder of 2.
Record the quotient 7 as the next digit in the result. 
Result so far: 37.0
Subtract 98 from 100 to get 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 14

Let's proceed to step 4:
The number 14 fits into 21 1 times, leaving a remainder of 7.
Put 1 as the next digit of the answer. 
Result so far: 371.0
Deduct 14 from 21 and we're left with 7.
Grab the next digit (2) from the dividend, add it to 7, then carry on: 72 / 14

Moving on to step 5:
If we divide 72 by 14, we get 5 and a remainder of 2.
The number 5 becomes the next digit in our result. 
Result so far: 3715.0
Subtracting 70 from 72 leaves us with 2.
Append the next digit (0) from the dividend to 2 and continue with: 20 / 14

Step 6:
20 divided by 14 is 1 with a remainder of 6.
Record the quotient 1 as the next digit in the result. 
Result so far: 37151.0
If we take 14 away from 20, we end up 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 7:
14 can be fit into 60 4 times, resulting in a remainder of 4.
Use 4 as the next digit of our solution. 
Result so far: 37151.4
Subtracting 56 from 60 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Going ahead to step 8:
The number 14 fits into 40 2 times, leaving a remainder of 12.
Put 2 as the next digit of the answer. 
Result so far: 37151.42
The remainder is 12 after subtracting 28 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 9:
When dividing 120 by 14, we get 8 with a remainder of 8.
The number 8 becomes the next digit in our result. 
Result so far: 37151.428
Deduct 112 from 120 and we're left 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.

Going ahead to step 10:
14 goes into 80 5 times with a remainder of 10.
Write down 5 as next digit of the result. 
Result so far: 37151.4285
If we take 70 away from 80, 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.

On to step 11:
When dividing 100 by 14, we get 7 with a remainder of 2.
Put 7 as the next digit of the answer. 
Result so far: 37151.42857
Subtract 98 from 100 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 12:
14 goes into 20 1 times with a remainder of 6.
Put 1 as the next digit of the answer. 
Result so far: 37151.428571
Subtract 14 from 20 to 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.

Moving on to step 13:
14 goes into 60 4 times with a remainder of 4.
Use 4 as the next digit of our solution. 
Result so far: 37151.4285714
If we subtract 56 from 60, we 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.

Moving on to step 14:
14 goes into 40 2 times with a remainder of 12.
Use 2 as the next digit of our solution. 
Result so far: 37151.42857142
The remainder is 12 after subtracting 28 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

After the division, we end up with 37151.42857142 and a remainder of 1.2e-08.