We look at the division of 70720032 by 509 
The aim is to understand the frequency of 509 in 70720032.

Step 1:
509 goes into 7 0 times with a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Include the next digit (0) from the dividend after 7, then repeat: 70 / 509

Step 2:
509 goes into 70 0 times with a remainder of 70.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 70, we get 70.
Fetch the next digit (7) from the dividend, attach it to 70 and continue: 707 / 509

Step 3:
The number 509 fits into 707 1 times, leaving a remainder of 198.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 509 from 707 leaves us with 198.
Include the next digit (2) from the dividend after 198, then repeat: 1982 / 509

Going ahead to step 4:
509 goes into 1982 3 times with a remainder of 455.
Write down 3 as next digit of the result. 
Result so far: 13.0
Subtracting 1527 from 1982 leaves us with 455.
Fetch the next digit (0) from the dividend, attach it to 455 and continue: 4550 / 509

On to step 5:
4550 divided by 509 is 8 with a remainder of 478.
Write down 8 as next digit of the result. 
Result so far: 138.0
Deduct 4072 from 4550 and we're left with 478.
Append the next digit (0) from the dividend to 478 and continue with: 4780 / 509

Let's proceed to step 6:
If we divide 4780 by 509, we get 9 and a remainder of 199.
Use 9 as the next digit of our solution. 
Result so far: 1389.0
If we subtract 4581 from 4780, we get 199.
Grab the next digit (3) from the dividend, add it to 199, then carry on: 1993 / 509

Advancing to step 7:
509 goes into 1993 3 times with a remainder of 466.
Record the quotient 3 as the next digit in the result. 
Result so far: 13893.0
Deduct 1527 from 1993 and we're left with 466.
Fetch the next digit (2) from the dividend, attach it to 466 and continue: 4662 / 509

Let's proceed to step 8:
509 can be fit into 4662 9 times, resulting in a remainder of 81.
The next digit of our result is 9. 
Result so far: 138939.0
Deduct 4581 from 4662 and we're left with 81.
Since there are no more digits in the dividend, we add a zero to the remainder making it 810, and continue the process.

Let's proceed to step 9:
810 divided by 509 is 1 with a remainder of 301.
The next digit of our result is 1. 
Result so far: 138939.1
The remainder is 301 after subtracting 509 from 810.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3010, and continue the process.

Advancing to step 10:
If we divide 3010 by 509, we get 5 and a remainder of 465.
The number 5 becomes the next digit in our result. 
Result so far: 138939.15
Subtracting 2545 from 3010 leaves us with 465.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4650, and continue the process.

Moving on to step 11:
If we divide 4650 by 509, we get 9 and a remainder of 69.
Record the quotient 9 as the next digit in the result. 
Result so far: 138939.159
Subtract 4581 from 4650 to get 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Advancing to step 12:
When dividing 690 by 509, we get 1 with a remainder of 181.
Write down 1 as next digit of the result. 
Result so far: 138939.1591
If we take 509 away from 690, we end up with 181.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1810, and continue the process.

Step 13:
When dividing 1810 by 509, we get 3 with a remainder of 283.
Put 3 as the next digit of the answer. 
Result so far: 138939.15913
If we subtract 1527 from 1810, we get 283.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2830, and continue the process.

On to step 14:
509 can be fit into 2830 5 times, resulting in a remainder of 285.
Write down 5 as next digit of the result. 
Result so far: 138939.159135
Deduct 2545 from 2830 and we're left with 285.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2850, and continue the process.

Going ahead to step 15:
The number 509 fits into 2850 5 times, leaving a remainder of 305.
Write down 5 as next digit of the result. 
Result so far: 138939.1591355
Subtracting 2545 from 2850 leaves us with 305.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3050, and continue the process.

The quotient of the division is 138939.1591355, and the remainder is 3.05e-06.