73218068 divided by 509 
The aim is to understand the frequency of 509 in 73218068.

Let's proceed to step 1:
7 divided by 509 is 0 with a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Take the next digit (3) from the dividend and append it to 7, then repeat: 73 / 509

Let's proceed to step 2:
509 goes into 73 0 times with a remainder of 73.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 73 after subtracting 0 from 73.
Append the next digit (2) from the dividend to 73 and continue with: 732 / 509

On to step 3:
509 goes into 732 1 times with a remainder of 223.
The next digit of our result is 1. 
Result so far: 1.0
If we take 509 away from 732, we end up with 223.
Take the next digit (1) from the dividend and append it to 223, then repeat: 2231 / 509

On to step 4:
If we divide 2231 by 509, we get 4 and a remainder of 195.
Record the quotient 4 as the next digit in the result. 
Result so far: 14.0
If we subtract 2036 from 2231, we get 195.
Append the next digit (8) from the dividend to 195 and continue with: 1958 / 509

Moving on to step 5:
509 can be fit into 1958 3 times, resulting in a remainder of 431.
Use 3 as the next digit of our solution. 
Result so far: 143.0
If we take 1527 away from 1958, we end up with 431.
Grab the next digit (0) from the dividend, add it to 431, then carry on: 4310 / 509

Moving on to step 6:
509 goes into 4310 8 times with a remainder of 238.
Write down 8 as next digit of the result. 
Result so far: 1438.0
The remainder is 238 after subtracting 4072 from 4310.
Take the next digit (6) from the dividend and append it to 238, then repeat: 2386 / 509

Going ahead to step 7:
509 can be fit into 2386 4 times, resulting in a remainder of 350.
The next digit of our result is 4. 
Result so far: 14384.0
If we subtract 2036 from 2386, we get 350.
Append the next digit (8) from the dividend to 350 and continue with: 3508 / 509

Step 8:
509 goes into 3508 6 times with a remainder of 454.
Write down 6 as next digit of the result. 
Result so far: 143846.0
Subtracting 3054 from 3508 leaves us with 454.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4540, and continue the process.

On to step 9:
509 can be fit into 4540 8 times, resulting in a remainder of 468.
The next digit of our result is 8. 
Result so far: 143846.8
Deduct 4072 from 4540 and we're left with 468.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4680, and continue the process.

Let's proceed to step 10:
If we divide 4680 by 509, we get 9 and a remainder of 99.
Write down 9 as next digit of the result. 
Result so far: 143846.89
Subtracting 4581 from 4680 leaves us with 99.
Since there are no more digits in the dividend, we add a zero to the remainder making it 990, and continue the process.

On to step 11:
509 goes into 990 1 times with a remainder of 481.
Use 1 as the next digit of our solution. 
Result so far: 143846.891
Subtract 509 from 990 to get 481.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4810, and continue the process.

Advancing to step 12:
The number 509 fits into 4810 9 times, leaving a remainder of 229.
The next digit of our result is 9. 
Result so far: 143846.8919
If we subtract 4581 from 4810, we get 229.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2290, and continue the process.

On to step 13:
When dividing 2290 by 509, we get 4 with a remainder of 254.
Use 4 as the next digit of our solution. 
Result so far: 143846.89194
If we subtract 2036 from 2290, we get 254.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2540, and continue the process.

On to step 14:
When dividing 2540 by 509, we get 4 with a remainder of 504.
Put 4 as the next digit of the answer. 
Result so far: 143846.891944
Subtracting 2036 from 2540 leaves us with 504.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5040, and continue the process.

The final outcome is 143846.891944, with a leftover of 5.04e-05.