We look at the division of 52550798 by 816 
The aim is to understand the frequency of 816 in 52550798.

Let's proceed to step 1:
When dividing 5 by 816, we get 0 with a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Bring next digit (2) of the dividend behind the 5 and repeat the process: 52 / 816

Step 2:
816 goes into 52 0 times with a remainder of 52.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 52 after subtracting 0 from 52.
Grab the next digit (5) from the dividend, add it to 52, then carry on: 525 / 816

Step 3:
816 goes into 525 0 times with a remainder of 525.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 525, we end up with 525.
Include the next digit (5) from the dividend after 525, then repeat: 5255 / 816

Going ahead to step 4:
816 can be fit into 5255 6 times, resulting in a remainder of 359.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
If we subtract 4896 from 5255, we get 359.
Take the next digit (0) from the dividend and append it to 359, then repeat: 3590 / 816

Advancing to step 5:
The number 816 fits into 3590 4 times, leaving a remainder of 326.
The next digit of our result is 4. 
Result so far: 64.0
Deduct 3264 from 3590 and we're left with 326.
Include the next digit (7) from the dividend after 326, then repeat: 3267 / 816

Let's proceed to step 6:
3267 divided by 816 is 4 with a remainder of 3.
Record the quotient 4 as the next digit in the result. 
Result so far: 644.0
Subtracting 3264 from 3267 leaves us with 3.
Append the next digit (9) from the dividend to 3 and continue with: 39 / 816

Let's proceed to step 7:
816 goes into 39 0 times with a remainder of 39.
Write down 0 as next digit of the result. 
Result so far: 6440.0
The remainder is 39 after subtracting 0 from 39.
Bring next digit (8) of the dividend behind the 39 and repeat the process: 398 / 816

Let's proceed to step 8:
The number 816 fits into 398 0 times, leaving a remainder of 398.
The number 0 becomes the next digit in our result. 
Result so far: 64400.0
If we take 0 away from 398, we end up with 398.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3980, and continue the process.

Step 9:
When dividing 3980 by 816, we get 4 with a remainder of 716.
Put 4 as the next digit of the answer. 
Result so far: 64400.4
Subtracting 3264 from 3980 leaves us with 716.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7160, and continue the process.

Step 10:
816 goes into 7160 8 times with a remainder of 632.
Use 8 as the next digit of our solution. 
Result so far: 64400.48
If we take 6528 away from 7160, we end up with 632.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6320, and continue the process.

Going ahead to step 11:
When dividing 6320 by 816, we get 7 with a remainder of 608.
The next digit of our result is 7. 
Result so far: 64400.487
If we take 5712 away from 6320, we end up with 608.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6080, and continue the process.

Moving on to step 12:
If we divide 6080 by 816, we get 7 and a remainder of 368.
The number 7 becomes the next digit in our result. 
Result so far: 64400.4877
Subtracting 5712 from 6080 leaves us with 368.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3680, and continue the process.

The final result is 64400.4877 with a remainder of 0.00368.