520141 ÷ 28 
The aim is to understand the frequency of 28 in 520141.

Advancing to step 1:
When dividing 5 by 28, we get 0 with a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Include the next digit (2) from the dividend after 5, then repeat: 52 / 28

Let's proceed to step 2:
28 can be fit into 52 1 times, resulting in a remainder of 24.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we subtract 28 from 52, we get 24.
Bring next digit (0) of the dividend behind the 24 and repeat the process: 240 / 28

Step 3:
When dividing 240 by 28, we get 8 with a remainder of 16.
Write down 8 as next digit of the result. 
Result so far: 18.0
If we take 224 away from 240, we end up with 16.
Append the next digit (1) from the dividend to 16 and continue with: 161 / 28

Let's proceed to step 4:
The number 28 fits into 161 5 times, leaving a remainder of 21.
Use 5 as the next digit of our solution. 
Result so far: 185.0
If we take 140 away from 161, we end up with 21.
Include the next digit (4) from the dividend after 21, then repeat: 214 / 28

Going ahead to step 5:
The number 28 fits into 214 7 times, leaving a remainder of 18.
Record the quotient 7 as the next digit in the result. 
Result so far: 1857.0
If we take 196 away from 214, we end up with 18.
Append the next digit (1) from the dividend to 18 and continue with: 181 / 28

Advancing to step 6:
If we divide 181 by 28, we get 6 and a remainder of 13.
Use 6 as the next digit of our solution. 
Result so far: 18576.0
Subtract 168 from 181 to get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

On to step 7:
The number 28 fits into 130 4 times, leaving a remainder of 18.
Write down 4 as next digit of the result. 
Result so far: 18576.4
If we take 112 away from 130, 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.

Advancing to step 8:
28 can be fit into 180 6 times, resulting in a remainder of 12.
Record the quotient 6 as the next digit in the result. 
Result so far: 18576.46
If we take 168 away from 180, we end up 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.

On to step 9:
The number 28 fits into 120 4 times, leaving a remainder of 8.
Record the quotient 4 as the next digit in the result. 
Result so far: 18576.464
Subtracting 112 from 120 leaves us 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.

On to step 10:
28 goes into 80 2 times with a remainder of 24.
Write down 2 as next digit of the result. 
Result so far: 18576.4642
Deduct 56 from 80 and we're left 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.

Going ahead to step 11:
If we divide 240 by 28, we get 8 and a remainder of 16.
Write down 8 as next digit of the result. 
Result so far: 18576.46428
Subtracting 224 from 240 leaves us with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Let's proceed to step 12:
28 goes into 160 5 times with a remainder of 20.
Use 5 as the next digit of our solution. 
Result so far: 18576.464285
Subtracting 140 from 160 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 13:
28 can be fit into 200 7 times, resulting in a remainder of 4.
Write down 7 as next digit of the result. 
Result so far: 18576.4642857
If we take 196 away from 200, we end up 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.

Let's proceed to step 14:
When dividing 40 by 28, we get 1 with a remainder of 12.
Use 1 as the next digit of our solution. 
Result so far: 18576.46428571
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.

The final outcome is 18576.46428571, with a leftover of 1.2e-08.