We look at the division of 1637726 by 809 
The aim is to understand the frequency of 809 in 1637726.

Going ahead to step 1:
If we divide 1 by 809, we get 0 and a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Grab the next digit (6) from the dividend, add it to 1, then carry on: 16 / 809

Step 2:
809 goes into 16 0 times with a remainder of 16.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 16 and we're left with 16.
Bring next digit (3) of the dividend behind the 16 and repeat the process: 163 / 809

Advancing to step 3:
If we divide 163 by 809, we get 0 and a remainder of 163.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 163 after subtracting 0 from 163.
Take the next digit (7) from the dividend and append it to 163, then repeat: 1637 / 809

On to step 4:
If we divide 1637 by 809, we get 2 and a remainder of 19.
The next digit of our result is 2. 
Result so far: 2.0
The remainder is 19 after subtracting 1618 from 1637.
Fetch the next digit (7) from the dividend, attach it to 19 and continue: 197 / 809

Step 5:
197 divided by 809 is 0 with a remainder of 197.
The next digit of our result is 0. 
Result so far: 20.0
If we take 0 away from 197, we end up with 197.
Include the next digit (2) from the dividend after 197, then repeat: 1972 / 809

Step 6:
The number 809 fits into 1972 2 times, leaving a remainder of 354.
The number 2 becomes the next digit in our result. 
Result so far: 202.0
If we take 1618 away from 1972, we end up with 354.
Grab the next digit (6) from the dividend, add it to 354, then carry on: 3546 / 809

Moving on to step 7:
809 goes into 3546 4 times with a remainder of 310.
Write down 4 as next digit of the result. 
Result so far: 2024.0
Subtracting 3236 from 3546 leaves us with 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3100, and continue the process.

Let's proceed to step 8:
If we divide 3100 by 809, we get 3 and a remainder of 673.
The next digit of our result is 3. 
Result so far: 2024.3
The remainder is 673 after subtracting 2427 from 3100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6730, and continue the process.

Advancing to step 9:
809 goes into 6730 8 times with a remainder of 258.
The number 8 becomes the next digit in our result. 
Result so far: 2024.38
Subtract 6472 from 6730 to 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.

Advancing to step 10:
2580 divided by 809 is 3 with a remainder of 153.
Use 3 as the next digit of our solution. 
Result so far: 2024.383
If we take 2427 away from 2580, we end up with 153.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1530, and continue the process.

On to step 11:
1530 divided by 809 is 1 with a remainder of 721.
Use 1 as the next digit of our solution. 
Result so far: 2024.3831
Deduct 809 from 1530 and we're left with 721.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7210, and continue the process.

Step 12:
The number 809 fits into 7210 8 times, leaving a remainder of 738.
The number 8 becomes the next digit in our result. 
Result so far: 2024.38318
If we take 6472 away from 7210, we end up with 738.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7380, and continue the process.

Advancing to step 13:
809 goes into 7380 9 times with a remainder of 99.
The next digit of our result is 9. 
Result so far: 2024.383189
Subtract 7281 from 7380 to get 99.
Since there are no more digits in the dividend, we add a zero to the remainder making it 990, and continue the process.

Let's proceed to step 14:
If we divide 990 by 809, we get 1 and a remainder of 181.
The next digit of our result is 1. 
Result so far: 2024.3831891
Subtracting 809 from 990 leaves us with 181.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1810, and continue the process.

On to step 15:
1810 divided by 809 is 2 with a remainder of 192.
Use 2 as the next digit of our solution. 
Result so far: 2024.38318912
Subtracting 1618 from 1810 leaves us with 192.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1920, and continue the process.

Our division results in 2024.38318912 with a remaining 1.92e-07.