25555528 ÷ 813 
The aim is to understand the frequency of 813 in 25555528.

Step 1:
When dividing 2 by 813, we get 0 with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Fetch the next digit (5) from the dividend, attach it to 2 and continue: 25 / 813

Step 2:
When dividing 25 by 813, we get 0 with a remainder of 25.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 25 after subtracting 0 from 25.
Bring next digit (5) of the dividend behind the 25 and repeat the process: 255 / 813

Advancing to step 3:
The number 813 fits into 255 0 times, leaving a remainder of 255.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 255 after subtracting 0 from 255.
Fetch the next digit (5) from the dividend, attach it to 255 and continue: 2555 / 813

On to step 4:
When dividing 2555 by 813, we get 3 with a remainder of 116.
Write down 3 as next digit of the result. 
Result so far: 3.0
Subtracting 2439 from 2555 leaves us with 116.
Include the next digit (5) from the dividend after 116, then repeat: 1165 / 813

Let's proceed to step 5:
When dividing 1165 by 813, we get 1 with a remainder of 352.
Write down 1 as next digit of the result. 
Result so far: 31.0
The remainder is 352 after subtracting 813 from 1165.
Append the next digit (5) from the dividend to 352 and continue with: 3525 / 813

Advancing to step 6:
If we divide 3525 by 813, we get 4 and a remainder of 273.
Use 4 as the next digit of our solution. 
Result so far: 314.0
If we take 3252 away from 3525, we end up with 273.
Grab the next digit (2) from the dividend, add it to 273, then carry on: 2732 / 813

Step 7:
2732 divided by 813 is 3 with a remainder of 293.
Put 3 as the next digit of the answer. 
Result so far: 3143.0
Deduct 2439 from 2732 and we're left with 293.
Fetch the next digit (8) from the dividend, attach it to 293 and continue: 2938 / 813

Let's proceed to step 8:
813 can be fit into 2938 3 times, resulting in a remainder of 499.
Record the quotient 3 as the next digit in the result. 
Result so far: 31433.0
Subtracting 2439 from 2938 leaves us with 499.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4990, and continue the process.

Let's proceed to step 9:
813 goes into 4990 6 times with a remainder of 112.
Put 6 as the next digit of the answer. 
Result so far: 31433.6
The remainder is 112 after subtracting 4878 from 4990.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1120, and continue the process.

Step 10:
The number 813 fits into 1120 1 times, leaving a remainder of 307.
Record the quotient 1 as the next digit in the result. 
Result so far: 31433.61
Subtracting 813 from 1120 leaves us with 307.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3070, and continue the process.

Going ahead to step 11:
When dividing 3070 by 813, we get 3 with a remainder of 631.
Record the quotient 3 as the next digit in the result. 
Result so far: 31433.613
If we subtract 2439 from 3070, we get 631.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6310, and continue the process.

Going ahead to step 12:
813 can be fit into 6310 7 times, resulting in a remainder of 619.
Record the quotient 7 as the next digit in the result. 
Result so far: 31433.6137
Subtract 5691 from 6310 to get 619.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6190, and continue the process.

Going ahead to step 13:
The number 813 fits into 6190 7 times, leaving a remainder of 499.
Write down 7 as next digit of the result. 
Result so far: 31433.61377
If we take 5691 away from 6190, we end up with 499.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4990, and continue the process.

The final outcome is 31433.61377, with a leftover of 0.000499.