13300029 ÷ 521 
The aim is to understand the frequency of 521 in 13300029.

Going ahead to step 1:
521 can be fit into 1 0 times, resulting in a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Bring next digit (3) of the dividend behind the 1 and repeat the process: 13 / 521

Going ahead to step 2:
The number 521 fits into 13 0 times, leaving a remainder of 13.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 13, we end up with 13.
Grab the next digit (3) from the dividend, add it to 13, then carry on: 133 / 521

Moving on to step 3:
521 can be fit into 133 0 times, resulting in a remainder of 133.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 133 leaves us with 133.
Grab the next digit (0) from the dividend, add it to 133, then carry on: 1330 / 521

Advancing to step 4:
521 can be fit into 1330 2 times, resulting in a remainder of 288.
Use 2 as the next digit of our solution. 
Result so far: 2.0
The remainder is 288 after subtracting 1042 from 1330.
Append the next digit (0) from the dividend to 288 and continue with: 2880 / 521

On to step 5:
When dividing 2880 by 521, we get 5 with a remainder of 275.
The number 5 becomes the next digit in our result. 
Result so far: 25.0
The remainder is 275 after subtracting 2605 from 2880.
Append the next digit (0) from the dividend to 275 and continue with: 2750 / 521

On to step 6:
2750 divided by 521 is 5 with a remainder of 145.
Put 5 as the next digit of the answer. 
Result so far: 255.0
The remainder is 145 after subtracting 2605 from 2750.
Bring next digit (2) of the dividend behind the 145 and repeat the process: 1452 / 521

Let's proceed to step 7:
521 can be fit into 1452 2 times, resulting in a remainder of 410.
Record the quotient 2 as the next digit in the result. 
Result so far: 2552.0
Deduct 1042 from 1452 and we're left with 410.
Take the next digit (9) from the dividend and append it to 410, then repeat: 4109 / 521

On to step 8:
4109 divided by 521 is 7 with a remainder of 462.
The number 7 becomes the next digit in our result. 
Result so far: 25527.0
Subtract 3647 from 4109 to get 462.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4620, and continue the process.

On to step 9:
The number 521 fits into 4620 8 times, leaving a remainder of 452.
Use 8 as the next digit of our solution. 
Result so far: 25527.8
Subtract 4168 from 4620 to get 452.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4520, and continue the process.

Advancing to step 10:
4520 divided by 521 is 8 with a remainder of 352.
The next digit of our result is 8. 
Result so far: 25527.88
If we subtract 4168 from 4520, we get 352.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3520, and continue the process.

The final outcome is 25527.88, with a leftover of 0.352.