We're dividing 77520806 by 550 
The aim is to understand the frequency of 550 in 77520806.

On to step 1:
The number 550 fits into 7 0 times, leaving a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Take the next digit (7) from the dividend and append it to 7, then repeat: 77 / 550

Moving on to step 2:
77 divided by 550 is 0 with a remainder of 77.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 77, we get 77.
Append the next digit (5) from the dividend to 77 and continue with: 775 / 550

Advancing to step 3:
550 goes into 775 1 times with a remainder of 225.
The next digit of our result is 1. 
Result so far: 1.0
Deduct 550 from 775 and we're left with 225.
Take the next digit (2) from the dividend and append it to 225, then repeat: 2252 / 550

Step 4:
550 can be fit into 2252 4 times, resulting in a remainder of 52.
The number 4 becomes the next digit in our result. 
Result so far: 14.0
Subtracting 2200 from 2252 leaves us with 52.
Take the next digit (0) from the dividend and append it to 52, then repeat: 520 / 550

Advancing to step 5:
520 divided by 550 is 0 with a remainder of 520.
Record the quotient 0 as the next digit in the result. 
Result so far: 140.0
If we subtract 0 from 520, we get 520.
Take the next digit (8) from the dividend and append it to 520, then repeat: 5208 / 550

Step 6:
The number 550 fits into 5208 9 times, leaving a remainder of 258.
Write down 9 as next digit of the result. 
Result so far: 1409.0
If we subtract 4950 from 5208, we get 258.
Append the next digit (0) from the dividend to 258 and continue with: 2580 / 550

On to step 7:
The number 550 fits into 2580 4 times, leaving a remainder of 380.
Put 4 as the next digit of the answer. 
Result so far: 14094.0
If we take 2200 away from 2580, we end up with 380.
Grab the next digit (6) from the dividend, add it to 380, then carry on: 3806 / 550

Let's proceed to step 8:
3806 divided by 550 is 6 with a remainder of 506.
The number 6 becomes the next digit in our result. 
Result so far: 140946.0
Subtracting 3300 from 3806 leaves us with 506.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5060, and continue the process.

On to step 9:
550 can be fit into 5060 9 times, resulting in a remainder of 110.
The next digit of our result is 9. 
Result so far: 140946.9
The remainder is 110 after subtracting 4950 from 5060.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

Going ahead to step 10:
550 can be fit into 1100 2 times, resulting in a remainder of 0.
The number 2 becomes the next digit in our result. 
Result so far: 140946.92
Subtract 1100 from 1100 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 11:
The number 550 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 140946.92
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 12:
550 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 140946.92
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 140946.92 and a remainder of 0.0.