We look at the division of 25856891 by 506 
The aim is to understand the frequency of 506 in 25856891.

Let's proceed to step 1:
When dividing 2 by 506, we get 0 with a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Bring next digit (5) of the dividend behind the 2 and repeat the process: 25 / 506

Going ahead to step 2:
When dividing 25 by 506, we get 0 with a remainder of 25.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 25, we get 25.
Bring next digit (8) of the dividend behind the 25 and repeat the process: 258 / 506

On to step 3:
258 divided by 506 is 0 with a remainder of 258.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 258, we get 258.
Include the next digit (5) from the dividend after 258, then repeat: 2585 / 506

Let's proceed to step 4:
506 can be fit into 2585 5 times, resulting in a remainder of 55.
Put 5 as the next digit of the answer. 
Result so far: 5.0
Deduct 2530 from 2585 and we're left with 55.
Include the next digit (6) from the dividend after 55, then repeat: 556 / 506

On to step 5:
506 can be fit into 556 1 times, resulting in a remainder of 50.
Record the quotient 1 as the next digit in the result. 
Result so far: 51.0
Subtracting 506 from 556 leaves us with 50.
Bring next digit (8) of the dividend behind the 50 and repeat the process: 508 / 506

Step 6:
508 divided by 506 is 1 with a remainder of 2.
Use 1 as the next digit of our solution. 
Result so far: 511.0
If we subtract 506 from 508, we get 2.
Take the next digit (9) from the dividend and append it to 2, then repeat: 29 / 506

Advancing to step 7:
506 goes into 29 0 times with a remainder of 29.
The next digit of our result is 0. 
Result so far: 5110.0
Subtracting 0 from 29 leaves us with 29.
Append the next digit (1) from the dividend to 29 and continue with: 291 / 506

On to step 8:
The number 506 fits into 291 0 times, leaving a remainder of 291.
The next digit of our result is 0. 
Result so far: 51100.0
The remainder is 291 after subtracting 0 from 291.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2910, and continue the process.

Advancing to step 9:
If we divide 2910 by 506, we get 5 and a remainder of 380.
Record the quotient 5 as the next digit in the result. 
Result so far: 51100.5
Subtracting 2530 from 2910 leaves us with 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3800, and continue the process.

Going ahead to step 10:
The number 506 fits into 3800 7 times, leaving a remainder of 258.
The next digit of our result is 7. 
Result so far: 51100.57
If we subtract 3542 from 3800, we get 258.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2580, and continue the process.

Let's proceed to step 11:
506 can be fit into 2580 5 times, resulting in a remainder of 50.
The number 5 becomes the next digit in our result. 
Result so far: 51100.575
If we take 2530 away from 2580, we end up with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Going ahead to step 12:
If we divide 500 by 506, we get 0 and a remainder of 500.
The number 0 becomes the next digit in our result. 
Result so far: 51100.575
If we subtract 0 from 500, we get 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5000, and continue the process.

On to step 13:
If we divide 5000 by 506, we get 9 and a remainder of 446.
Record the quotient 9 as the next digit in the result. 
Result so far: 51100.57509
Subtract 4554 from 5000 to get 446.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4460, and continue the process.

Moving on to step 14:
The number 506 fits into 4460 8 times, leaving a remainder of 412.
Write down 8 as next digit of the result. 
Result so far: 51100.575098
The remainder is 412 after subtracting 4048 from 4460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4120, and continue the process.

Going ahead to step 15:
506 goes into 4120 8 times with a remainder of 72.
Put 8 as the next digit of the answer. 
Result so far: 51100.5750988
If we take 4048 away from 4120, we end up with 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

The final result is 51100.5750988 with a remainder of 7.2e-07.