We're dividing 81811990 by 826 
The aim is to understand the frequency of 826 in 81811990.

Going ahead to step 1:
The number 826 fits into 8 0 times, leaving a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Include the next digit (1) from the dividend after 8, then repeat: 81 / 826

Step 2:
826 goes into 81 0 times with a remainder of 81.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 81 and we're left with 81.
Take the next digit (8) from the dividend and append it to 81, then repeat: 818 / 826

Going ahead to step 3:
818 divided by 826 is 0 with a remainder of 818.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 818, we end up with 818.
Fetch the next digit (1) from the dividend, attach it to 818 and continue: 8181 / 826

Going ahead to step 4:
When dividing 8181 by 826, we get 9 with a remainder of 747.
Write down 9 as next digit of the result. 
Result so far: 9.0
If we take 7434 away from 8181, we end up with 747.
Take the next digit (1) from the dividend and append it to 747, then repeat: 7471 / 826

Advancing to step 5:
7471 divided by 826 is 9 with a remainder of 37.
The next digit of our result is 9. 
Result so far: 99.0
If we subtract 7434 from 7471, we get 37.
Bring next digit (9) of the dividend behind the 37 and repeat the process: 379 / 826

On to step 6:
The number 826 fits into 379 0 times, leaving a remainder of 379.
The next digit of our result is 0. 
Result so far: 990.0
If we subtract 0 from 379, we get 379.
Bring next digit (9) of the dividend behind the 379 and repeat the process: 3799 / 826

Going ahead to step 7:
When dividing 3799 by 826, we get 4 with a remainder of 495.
Put 4 as the next digit of the answer. 
Result so far: 9904.0
If we subtract 3304 from 3799, we get 495.
Take the next digit (0) from the dividend and append it to 495, then repeat: 4950 / 826

On to step 8:
If we divide 4950 by 826, we get 5 and a remainder of 820.
Put 5 as the next digit of the answer. 
Result so far: 99045.0
The remainder is 820 after subtracting 4130 from 4950.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8200, and continue the process.

On to step 9:
826 goes into 8200 9 times with a remainder of 766.
Write down 9 as next digit of the result. 
Result so far: 99045.9
Subtracting 7434 from 8200 leaves us with 766.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7660, and continue the process.

Let's proceed to step 10:
826 can be fit into 7660 9 times, resulting in a remainder of 226.
Record the quotient 9 as the next digit in the result. 
Result so far: 99045.99
Subtracting 7434 from 7660 leaves us with 226.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2260, and continue the process.

In conclusion, the division gives 99045.99 with a balance of 0.226.