Let's divide 75562211 by 509
The aim is to understand the frequency of 509 in 75562211.

Going ahead to step 1:
509 goes into 7 0 times with a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Take the next digit (5) from the dividend and append it to 7, then repeat: 75 / 509

Moving on to step 2:
The number 509 fits into 75 0 times, leaving a remainder of 75.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 75 after subtracting 0 from 75.
Fetch the next digit (5) from the dividend, attach it to 75 and continue: 755 / 509

Step 3:
509 can be fit into 755 1 times, resulting in a remainder of 246.
Use 1 as the next digit of our solution. 
Result so far: 1.0
The remainder is 246 after subtracting 509 from 755.
Bring next digit (6) of the dividend behind the 246 and repeat the process: 2466 / 509

Advancing to step 4:
2466 divided by 509 is 4 with a remainder of 430.
The next digit of our result is 4. 
Result so far: 14.0
Subtracting 2036 from 2466 leaves us with 430.
Grab the next digit (2) from the dividend, add it to 430, then carry on: 4302 / 509

On to step 5:
If we divide 4302 by 509, we get 8 and a remainder of 230.
Use 8 as the next digit of our solution. 
Result so far: 148.0
If we take 4072 away from 4302, we end up with 230.
Include the next digit (2) from the dividend after 230, then repeat: 2302 / 509

Step 6:
The number 509 fits into 2302 4 times, leaving a remainder of 266.
The next digit of our result is 4. 
Result so far: 1484.0
Subtracting 2036 from 2302 leaves us with 266.
Fetch the next digit (1) from the dividend, attach it to 266 and continue: 2661 / 509

Moving on to step 7:
The number 509 fits into 2661 5 times, leaving a remainder of 116.
The number 5 becomes the next digit in our result. 
Result so far: 14845.0
Subtracting 2545 from 2661 leaves us with 116.
Fetch the next digit (1) from the dividend, attach it to 116 and continue: 1161 / 509

Advancing to step 8:
509 goes into 1161 2 times with a remainder of 143.
Write down 2 as next digit of the result. 
Result so far: 148452.0
If we subtract 1018 from 1161, we get 143.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1430, and continue the process.

Advancing to step 9:
1430 divided by 509 is 2 with a remainder of 412.
Use 2 as the next digit of our solution. 
Result so far: 148452.2
If we take 1018 away from 1430, we end up with 412.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4120, and continue the process.

Advancing to step 10:
509 can be fit into 4120 8 times, resulting in a remainder of 48.
Put 8 as the next digit of the answer. 
Result so far: 148452.28
If we subtract 4072 from 4120, we get 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Advancing to step 11:
509 can be fit into 480 0 times, resulting in a remainder of 480.
Put 0 as the next digit of the answer. 
Result so far: 148452.28
Deduct 0 from 480 and we're left with 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4800, and continue the process.

Let's proceed to step 12:
The number 509 fits into 4800 9 times, leaving a remainder of 219.
The number 9 becomes the next digit in our result. 
Result so far: 148452.2809
Deduct 4581 from 4800 and we're left with 219.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2190, and continue the process.

Going ahead to step 13:
When dividing 2190 by 509, we get 4 with a remainder of 154.
The next digit of our result is 4. 
Result so far: 148452.28094
The remainder is 154 after subtracting 2036 from 2190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1540, and continue the process.

Step 14:
If we divide 1540 by 509, we get 3 and a remainder of 13.
The next digit of our result is 3. 
Result so far: 148452.280943
Subtract 1527 from 1540 to get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Let's proceed to step 15:
The number 509 fits into 130 0 times, leaving a remainder of 130.
The number 0 becomes the next digit in our result. 
Result so far: 148452.280943
If we subtract 0 from 130, we get 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1300, and continue the process.

Advancing to step 16:
If we divide 1300 by 509, we get 2 and a remainder of 282.
Record the quotient 2 as the next digit in the result. 
Result so far: 148452.28094302
If we subtract 1018 from 1300, we get 282.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2820, and continue the process.

The final result is 148452.28094302 with a remainder of 2.82e-07.