1262508 divided by 521 
The aim is to understand the frequency of 521 in 1262508.

Advancing to step 1:
The number 521 fits into 1 0 times, leaving a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Append the next digit (2) from the dividend to 1 and continue with: 12 / 521

Moving on to step 2:
When dividing 12 by 521, we get 0 with a remainder of 12.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 12 and we're left with 12.
Take the next digit (6) from the dividend and append it to 12, then repeat: 126 / 521

Let's proceed to step 3:
The number 521 fits into 126 0 times, leaving a remainder of 126.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 126 after subtracting 0 from 126.
Include the next digit (2) from the dividend after 126, then repeat: 1262 / 521

Advancing to step 4:
When dividing 1262 by 521, we get 2 with a remainder of 220.
Write down 2 as next digit of the result. 
Result so far: 2.0
If we subtract 1042 from 1262, we get 220.
Include the next digit (5) from the dividend after 220, then repeat: 2205 / 521

Step 5:
If we divide 2205 by 521, we get 4 and a remainder of 121.
Use 4 as the next digit of our solution. 
Result so far: 24.0
Deduct 2084 from 2205 and we're left with 121.
Bring next digit (0) of the dividend behind the 121 and repeat the process: 1210 / 521

Going ahead to step 6:
When dividing 1210 by 521, we get 2 with a remainder of 168.
Put 2 as the next digit of the answer. 
Result so far: 242.0
Subtract 1042 from 1210 to get 168.
Fetch the next digit (8) from the dividend, attach it to 168 and continue: 1688 / 521

Advancing to step 7:
The number 521 fits into 1688 3 times, leaving a remainder of 125.
Record the quotient 3 as the next digit in the result. 
Result so far: 2423.0
If we subtract 1563 from 1688, we get 125.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1250, and continue the process.

On to step 8:
If we divide 1250 by 521, we get 2 and a remainder of 208.
Write down 2 as next digit of the result. 
Result so far: 2423.2
If we subtract 1042 from 1250, we get 208.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2080, and continue the process.

Going ahead to step 9:
The number 521 fits into 2080 3 times, leaving a remainder of 517.
Put 3 as the next digit of the answer. 
Result so far: 2423.23
Subtract 1563 from 2080 to get 517.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5170, and continue the process.

Moving on to step 10:
521 can be fit into 5170 9 times, resulting in a remainder of 481.
Record the quotient 9 as the next digit in the result. 
Result so far: 2423.239
Subtracting 4689 from 5170 leaves us with 481.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4810, and continue the process.

On to step 11:
When dividing 4810 by 521, we get 9 with a remainder of 121.
Write down 9 as next digit of the result. 
Result so far: 2423.2399
Subtract 4689 from 4810 to get 121.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1210, and continue the process.

After the division, we end up with 2423.2399 and a remainder of 0.00121.