Let's divide 80688298 by 509
The aim is to understand the frequency of 509 in 80688298.

On to step 1:
509 can be fit into 8 0 times, resulting in a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Fetch the next digit (0) from the dividend, attach it to 8 and continue: 80 / 509

Step 2:
509 can be fit into 80 0 times, resulting in a remainder of 80.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 80, we get 80.
Include the next digit (6) from the dividend after 80, then repeat: 806 / 509

Let's proceed to step 3:
806 divided by 509 is 1 with a remainder of 297.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we subtract 509 from 806, we get 297.
Fetch the next digit (8) from the dividend, attach it to 297 and continue: 2978 / 509

Moving on to step 4:
The number 509 fits into 2978 5 times, leaving a remainder of 433.
The number 5 becomes the next digit in our result. 
Result so far: 15.0
If we subtract 2545 from 2978, we get 433.
Bring next digit (8) of the dividend behind the 433 and repeat the process: 4338 / 509

Going ahead to step 5:
509 can be fit into 4338 8 times, resulting in a remainder of 266.
Write down 8 as next digit of the result. 
Result so far: 158.0
Subtracting 4072 from 4338 leaves us with 266.
Bring next digit (2) of the dividend behind the 266 and repeat the process: 2662 / 509

Going ahead to step 6:
509 goes into 2662 5 times with a remainder of 117.
The next digit of our result is 5. 
Result so far: 1585.0
Subtracting 2545 from 2662 leaves us with 117.
Append the next digit (9) from the dividend to 117 and continue with: 1179 / 509

Step 7:
If we divide 1179 by 509, we get 2 and a remainder of 161.
Use 2 as the next digit of our solution. 
Result so far: 15852.0
Subtracting 1018 from 1179 leaves us with 161.
Append the next digit (8) from the dividend to 161 and continue with: 1618 / 509

On to step 8:
509 can be fit into 1618 3 times, resulting in a remainder of 91.
Put 3 as the next digit of the answer. 
Result so far: 158523.0
The remainder is 91 after subtracting 1527 from 1618.
Since there are no more digits in the dividend, we add a zero to the remainder making it 910, and continue the process.

Let's proceed to step 9:
The number 509 fits into 910 1 times, leaving a remainder of 401.
Use 1 as the next digit of our solution. 
Result so far: 158523.1
If we take 509 away from 910, we end up with 401.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4010, and continue the process.

Step 10:
If we divide 4010 by 509, we get 7 and a remainder of 447.
Put 7 as the next digit of the answer. 
Result so far: 158523.17
Deduct 3563 from 4010 and we're left with 447.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4470, and continue the process.

Moving on to step 11:
4470 divided by 509 is 8 with a remainder of 398.
Write down 8 as next digit of the result. 
Result so far: 158523.178
Subtracting 4072 from 4470 leaves us 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 12:
When dividing 3980 by 509, we get 7 with a remainder of 417.
Use 7 as the next digit of our solution. 
Result so far: 158523.1787
If we take 3563 away from 3980, we end up with 417.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4170, and continue the process.

Let's proceed to step 13:
When dividing 4170 by 509, we get 8 with a remainder of 98.
The next digit of our result is 8. 
Result so far: 158523.17878
If we take 4072 away from 4170, we end up with 98.
Since there are no more digits in the dividend, we add a zero to the remainder making it 980, and continue the process.

Moving on to step 14:
When dividing 980 by 509, we get 1 with a remainder of 471.
Write down 1 as next digit of the result. 
Result so far: 158523.178781
If we subtract 509 from 980, we get 471.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4710, and continue the process.

Going ahead to step 15:
The number 509 fits into 4710 9 times, leaving a remainder of 129.
Write down 9 as next digit of the result. 
Result so far: 158523.1787819
If we take 4581 away from 4710, we end up with 129.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1290, and continue the process.

On to step 16:
509 goes into 1290 2 times with a remainder of 272.
The number 2 becomes the next digit in our result. 
Result so far: 158523.17878192
The remainder is 272 after subtracting 1018 from 1290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2720, and continue the process.

The final outcome is 158523.17878192, with a leftover of 2.72e-07.