Let's divide 81618220 by 838
The aim is to understand the frequency of 838 in 81618220.

On to step 1:
If we divide 8 by 838, we get 0 and a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Grab the next digit (1) from the dividend, add it to 8, then carry on: 81 / 838

On to step 2:
If we divide 81 by 838, we get 0 and a remainder of 81.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 81 after subtracting 0 from 81.
Take the next digit (6) from the dividend and append it to 81, then repeat: 816 / 838

Moving on to step 3:
838 can be fit into 816 0 times, resulting in a remainder of 816.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 816 and we're left with 816.
Bring next digit (1) of the dividend behind the 816 and repeat the process: 8161 / 838

Advancing to step 4:
838 can be fit into 8161 9 times, resulting in a remainder of 619.
Put 9 as the next digit of the answer. 
Result so far: 9.0
Subtract 7542 from 8161 to get 619.
Fetch the next digit (8) from the dividend, attach it to 619 and continue: 6198 / 838

Advancing to step 5:
838 can be fit into 6198 7 times, resulting in a remainder of 332.
Record the quotient 7 as the next digit in the result. 
Result so far: 97.0
If we take 5866 away from 6198, we end up with 332.
Include the next digit (2) from the dividend after 332, then repeat: 3322 / 838

Step 6:
3322 divided by 838 is 3 with a remainder of 808.
The next digit of our result is 3. 
Result so far: 973.0
Deduct 2514 from 3322 and we're left with 808.
Bring next digit (2) of the dividend behind the 808 and repeat the process: 8082 / 838

On to step 7:
8082 divided by 838 is 9 with a remainder of 540.
Write down 9 as next digit of the result. 
Result so far: 9739.0
If we subtract 7542 from 8082, we get 540.
Append the next digit (0) from the dividend to 540 and continue with: 5400 / 838

Moving on to step 8:
838 can be fit into 5400 6 times, resulting in a remainder of 372.
The next digit of our result is 6. 
Result so far: 97396.0
Subtract 5028 from 5400 to get 372.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3720, and continue the process.

Let's proceed to step 9:
838 can be fit into 3720 4 times, resulting in a remainder of 368.
Use 4 as the next digit of our solution. 
Result so far: 97396.4
The remainder is 368 after subtracting 3352 from 3720.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3680, and continue the process.

Let's proceed to step 10:
The number 838 fits into 3680 4 times, leaving a remainder of 328.
Use 4 as the next digit of our solution. 
Result so far: 97396.44
Subtract 3352 from 3680 to get 328.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3280, and continue the process.

The final outcome is 97396.44, with a leftover of 0.328.