We look at the division of 80807897 by 553 
The aim is to understand the frequency of 553 in 80807897.

On to step 1:
553 goes into 8 0 times with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Include the next digit (0) from the dividend after 8, then repeat: 80 / 553

Advancing to step 2:
When dividing 80 by 553, we get 0 with a remainder of 80.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 80 leaves us with 80.
Bring next digit (8) of the dividend behind the 80 and repeat the process: 808 / 553

Step 3:
808 divided by 553 is 1 with a remainder of 255.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we subtract 553 from 808, we get 255.
Bring next digit (0) of the dividend behind the 255 and repeat the process: 2550 / 553

Let's proceed to step 4:
When dividing 2550 by 553, we get 4 with a remainder of 338.
Record the quotient 4 as the next digit in the result. 
Result so far: 14.0
If we subtract 2212 from 2550, we get 338.
Include the next digit (7) from the dividend after 338, then repeat: 3387 / 553

Let's proceed to step 5:
When dividing 3387 by 553, we get 6 with a remainder of 69.
Put 6 as the next digit of the answer. 
Result so far: 146.0
Subtracting 3318 from 3387 leaves us with 69.
Grab the next digit (8) from the dividend, add it to 69, then carry on: 698 / 553

Moving on to step 6:
553 goes into 698 1 times with a remainder of 145.
The number 1 becomes the next digit in our result. 
Result so far: 1461.0
If we subtract 553 from 698, we get 145.
Fetch the next digit (9) from the dividend, attach it to 145 and continue: 1459 / 553

Advancing to step 7:
When dividing 1459 by 553, we get 2 with a remainder of 353.
The number 2 becomes the next digit in our result. 
Result so far: 14612.0
Deduct 1106 from 1459 and we're left with 353.
Fetch the next digit (7) from the dividend, attach it to 353 and continue: 3537 / 553

Advancing to step 8:
553 can be fit into 3537 6 times, resulting in a remainder of 219.
The next digit of our result is 6. 
Result so far: 146126.0
Subtract 3318 from 3537 to get 219.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2190, and continue the process.

Moving on to step 9:
The number 553 fits into 2190 3 times, leaving a remainder of 531.
Write down 3 as next digit of the result. 
Result so far: 146126.3
If we take 1659 away from 2190, we end up with 531.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5310, and continue the process.

Going ahead to step 10:
When dividing 5310 by 553, we get 9 with a remainder of 333.
Put 9 as the next digit of the answer. 
Result so far: 146126.39
Subtracting 4977 from 5310 leaves us with 333.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3330, and continue the process.

Step 11:
The number 553 fits into 3330 6 times, leaving a remainder of 12.
The number 6 becomes the next digit in our result. 
Result so far: 146126.396
If we take 3318 away from 3330, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Let's proceed to step 12:
The number 553 fits into 120 0 times, leaving a remainder of 120.
Put 0 as the next digit of the answer. 
Result so far: 146126.396
The remainder is 120 after subtracting 0 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Going ahead to step 13:
1200 divided by 553 is 2 with a remainder of 94.
The number 2 becomes the next digit in our result. 
Result so far: 146126.39602
The remainder is 94 after subtracting 1106 from 1200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 940, and continue the process.

Going ahead to step 14:
When dividing 940 by 553, we get 1 with a remainder of 387.
Use 1 as the next digit of our solution. 
Result so far: 146126.396021
The remainder is 387 after subtracting 553 from 940.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3870, and continue the process.

Going ahead to step 15:
When dividing 3870 by 553, we get 6 with a remainder of 552.
Record the quotient 6 as the next digit in the result. 
Result so far: 146126.3960216
Subtract 3318 from 3870 to get 552.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5520, and continue the process.

Going ahead to step 16:
553 goes into 5520 9 times with a remainder of 543.
Put 9 as the next digit of the answer. 
Result so far: 146126.39602169
Subtract 4977 from 5520 to get 543.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5430, and continue the process.

The final outcome is 146126.39602169, with a leftover of 5.43e-07.