We're dividing 77076172 by 509 
The aim is to understand the frequency of 509 in 77076172.

Moving on to step 1:
If we divide 7 by 509, we get 0 and a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Fetch the next digit (7) from the dividend, attach it to 7 and continue: 77 / 509

Let's proceed to step 2:
If we divide 77 by 509, we get 0 and a remainder of 77.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 77, we end up with 77.
Fetch the next digit (0) from the dividend, attach it to 77 and continue: 770 / 509

Moving on to step 3:
When dividing 770 by 509, we get 1 with a remainder of 261.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtract 509 from 770 to get 261.
Take the next digit (7) from the dividend and append it to 261, then repeat: 2617 / 509

Let's proceed to step 4:
The number 509 fits into 2617 5 times, leaving a remainder of 72.
The next digit of our result is 5. 
Result so far: 15.0
The remainder is 72 after subtracting 2545 from 2617.
Append the next digit (6) from the dividend to 72 and continue with: 726 / 509

Advancing to step 5:
509 goes into 726 1 times with a remainder of 217.
Write down 1 as next digit of the result. 
Result so far: 151.0
Subtract 509 from 726 to get 217.
Append the next digit (1) from the dividend to 217 and continue with: 2171 / 509

Going ahead to step 6:
509 can be fit into 2171 4 times, resulting in a remainder of 135.
The number 4 becomes the next digit in our result. 
Result so far: 1514.0
The remainder is 135 after subtracting 2036 from 2171.
Grab the next digit (7) from the dividend, add it to 135, then carry on: 1357 / 509

Step 7:
1357 divided by 509 is 2 with a remainder of 339.
Write down 2 as next digit of the result. 
Result so far: 15142.0
The remainder is 339 after subtracting 1018 from 1357.
Grab the next digit (2) from the dividend, add it to 339, then carry on: 3392 / 509

On to step 8:
509 can be fit into 3392 6 times, resulting in a remainder of 338.
Record the quotient 6 as the next digit in the result. 
Result so far: 151426.0
The remainder is 338 after subtracting 3054 from 3392.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3380, and continue the process.

On to step 9:
When dividing 3380 by 509, we get 6 with a remainder of 326.
Record the quotient 6 as the next digit in the result. 
Result so far: 151426.6
The remainder is 326 after subtracting 3054 from 3380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3260, and continue the process.

On to step 10:
3260 divided by 509 is 6 with a remainder of 206.
Write down 6 as next digit of the result. 
Result so far: 151426.66
If we take 3054 away from 3260, we end up with 206.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2060, and continue the process.

The final result is 151426.66 with a remainder of 0.206.