We divide 54161001 by 520
The aim is to understand the frequency of 520 in 54161001.

Let's proceed to step 1:
When dividing 5 by 520, we get 0 with a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Grab the next digit (4) from the dividend, add it to 5, then carry on: 54 / 520

Step 2:
520 can be fit into 54 0 times, resulting in a remainder of 54.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 54 and we're left with 54.
Include the next digit (1) from the dividend after 54, then repeat: 541 / 520

Advancing to step 3:
520 can be fit into 541 1 times, resulting in a remainder of 21.
Put 1 as the next digit of the answer. 
Result so far: 1.0
The remainder is 21 after subtracting 520 from 541.
Append the next digit (6) from the dividend to 21 and continue with: 216 / 520

On to step 4:
When dividing 216 by 520, we get 0 with a remainder of 216.
Use 0 as the next digit of our solution. 
Result so far: 10.0
Subtract 0 from 216 to get 216.
Bring next digit (1) of the dividend behind the 216 and repeat the process: 2161 / 520

On to step 5:
520 goes into 2161 4 times with a remainder of 81.
Write down 4 as next digit of the result. 
Result so far: 104.0
Subtract 2080 from 2161 to get 81.
Include the next digit (0) from the dividend after 81, then repeat: 810 / 520

Moving on to step 6:
When dividing 810 by 520, we get 1 with a remainder of 290.
Use 1 as the next digit of our solution. 
Result so far: 1041.0
If we subtract 520 from 810, we get 290.
Bring next digit (0) of the dividend behind the 290 and repeat the process: 2900 / 520

Moving on to step 7:
When dividing 2900 by 520, we get 5 with a remainder of 300.
The number 5 becomes the next digit in our result. 
Result so far: 10415.0
Subtracting 2600 from 2900 leaves us with 300.
Grab the next digit (1) from the dividend, add it to 300, then carry on: 3001 / 520

Going ahead to step 8:
If we divide 3001 by 520, we get 5 and a remainder of 401.
The number 5 becomes the next digit in our result. 
Result so far: 104155.0
If we take 2600 away from 3001, we end up with 401.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4010, and continue the process.

Going ahead to step 9:
The number 520 fits into 4010 7 times, leaving a remainder of 370.
Record the quotient 7 as the next digit in the result. 
Result so far: 104155.7
Subtract 3640 from 4010 to get 370.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3700, and continue the process.

Advancing to step 10:
520 can be fit into 3700 7 times, resulting in a remainder of 60.
The next digit of our result is 7. 
Result so far: 104155.77
If we take 3640 away from 3700, we end up with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

The final outcome is 104155.77, with a leftover of 0.06.