57589663 ÷ 521 
The aim is to understand the frequency of 521 in 57589663.

On to step 1:
521 goes into 5 0 times with a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Include the next digit (7) from the dividend after 5, then repeat: 57 / 521

Advancing to step 2:
If we divide 57 by 521, we get 0 and a remainder of 57.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 57 leaves us with 57.
Take the next digit (5) from the dividend and append it to 57, then repeat: 575 / 521

Step 3:
521 can be fit into 575 1 times, resulting in a remainder of 54.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtract 521 from 575 to get 54.
Include the next digit (8) from the dividend after 54, then repeat: 548 / 521

Going ahead to step 4:
548 divided by 521 is 1 with a remainder of 27.
Record the quotient 1 as the next digit in the result. 
Result so far: 11.0
If we subtract 521 from 548, we get 27.
Grab the next digit (9) from the dividend, add it to 27, then carry on: 279 / 521

On to step 5:
When dividing 279 by 521, we get 0 with a remainder of 279.
Put 0 as the next digit of the answer. 
Result so far: 110.0
If we take 0 away from 279, we end up with 279.
Take the next digit (6) from the dividend and append it to 279, then repeat: 2796 / 521

Let's proceed to step 6:
2796 divided by 521 is 5 with a remainder of 191.
Put 5 as the next digit of the answer. 
Result so far: 1105.0
Subtract 2605 from 2796 to get 191.
Take the next digit (6) from the dividend and append it to 191, then repeat: 1916 / 521

Going ahead to step 7:
When dividing 1916 by 521, we get 3 with a remainder of 353.
Write down 3 as next digit of the result. 
Result so far: 11053.0
Subtracting 1563 from 1916 leaves us with 353.
Take the next digit (3) from the dividend and append it to 353, then repeat: 3533 / 521

On to step 8:
If we divide 3533 by 521, we get 6 and a remainder of 407.
The number 6 becomes the next digit in our result. 
Result so far: 110536.0
Deduct 3126 from 3533 and we're left with 407.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4070, and continue the process.

Moving on to step 9:
4070 divided by 521 is 7 with a remainder of 423.
Write down 7 as next digit of the result. 
Result so far: 110536.7
If we take 3647 away from 4070, we end up with 423.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4230, and continue the process.

Moving on to step 10:
If we divide 4230 by 521, we get 8 and a remainder of 62.
Use 8 as the next digit of our solution. 
Result so far: 110536.78
Subtracting 4168 from 4230 leaves us with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

On to step 11:
When dividing 620 by 521, we get 1 with a remainder of 99.
Record the quotient 1 as the next digit in the result. 
Result so far: 110536.781
The remainder is 99 after subtracting 521 from 620.
Since there are no more digits in the dividend, we add a zero to the remainder making it 990, and continue the process.

Advancing to step 12:
521 can be fit into 990 1 times, resulting in a remainder of 469.
Put 1 as the next digit of the answer. 
Result so far: 110536.7811
Deduct 521 from 990 and we're left with 469.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4690, and continue the process.

The final result is 110536.7811 with a remainder of 0.00469.