25017395 divided by 809 
The aim is to understand the frequency of 809 in 25017395.

On to step 1:
809 can be fit into 2 0 times, resulting in a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Include the next digit (5) from the dividend after 2, then repeat: 25 / 809

Moving on to step 2:
The number 809 fits into 25 0 times, leaving a remainder of 25.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 25 and we're left with 25.
Grab the next digit (0) from the dividend, add it to 25, then carry on: 250 / 809

Moving on to step 3:
809 goes into 250 0 times with a remainder of 250.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 250, we end up with 250.
Fetch the next digit (1) from the dividend, attach it to 250 and continue: 2501 / 809

On to step 4:
2501 divided by 809 is 3 with a remainder of 74.
Put 3 as the next digit of the answer. 
Result so far: 3.0
The remainder is 74 after subtracting 2427 from 2501.
Fetch the next digit (7) from the dividend, attach it to 74 and continue: 747 / 809

Step 5:
747 divided by 809 is 0 with a remainder of 747.
The number 0 becomes the next digit in our result. 
Result so far: 30.0
Subtracting 0 from 747 leaves us with 747.
Take the next digit (3) from the dividend and append it to 747, then repeat: 7473 / 809

Step 6:
The number 809 fits into 7473 9 times, leaving a remainder of 192.
Put 9 as the next digit of the answer. 
Result so far: 309.0
Subtracting 7281 from 7473 leaves us with 192.
Include the next digit (9) from the dividend after 192, then repeat: 1929 / 809

Step 7:
The number 809 fits into 1929 2 times, leaving a remainder of 311.
Write down 2 as next digit of the result. 
Result so far: 3092.0
If we subtract 1618 from 1929, we get 311.
Grab the next digit (5) from the dividend, add it to 311, then carry on: 3115 / 809

Advancing to step 8:
The number 809 fits into 3115 3 times, leaving a remainder of 688.
The next digit of our result is 3. 
Result so far: 30923.0
Subtracting 2427 from 3115 leaves us with 688.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6880, and continue the process.

Going ahead to step 9:
6880 divided by 809 is 8 with a remainder of 408.
Record the quotient 8 as the next digit in the result. 
Result so far: 30923.8
If we subtract 6472 from 6880, we get 408.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4080, and continue the process.

Moving on to step 10:
809 can be fit into 4080 5 times, resulting in a remainder of 35.
Write down 5 as next digit of the result. 
Result so far: 30923.85
If we subtract 4045 from 4080, we get 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

On to step 11:
809 goes into 350 0 times with a remainder of 350.
Put 0 as the next digit of the answer. 
Result so far: 30923.85
Deduct 0 from 350 and we're left with 350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3500, and continue the process.

Going ahead to step 12:
809 goes into 3500 4 times with a remainder of 264.
Write down 4 as next digit of the result. 
Result so far: 30923.8504
If we subtract 3236 from 3500, we get 264.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2640, and continue the process.

Advancing to step 13:
When dividing 2640 by 809, we get 3 with a remainder of 213.
Record the quotient 3 as the next digit in the result. 
Result so far: 30923.85043
Subtracting 2427 from 2640 leaves us with 213.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2130, and continue the process.

Advancing to step 14:
When dividing 2130 by 809, we get 2 with a remainder of 512.
Write down 2 as next digit of the result. 
Result so far: 30923.850432
If we take 1618 away from 2130, we end up with 512.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5120, and continue the process.

Let's proceed to step 15:
809 goes into 5120 6 times with a remainder of 266.
Record the quotient 6 as the next digit in the result. 
Result so far: 30923.8504326
If we take 4854 away from 5120, we end up with 266.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2660, and continue the process.

On to step 16:
2660 divided by 809 is 3 with a remainder of 233.
Record the quotient 3 as the next digit in the result. 
Result so far: 30923.85043263
If we take 2427 away from 2660, we end up with 233.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2330, and continue the process.

Our division results in 30923.85043263 with a remaining 2.33e-07.