We're dividing 77878557 by 455 
The aim is to understand the frequency of 455 in 77878557.

Going ahead to step 1:
7 divided by 455 is 0 with a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Include the next digit (7) from the dividend after 7, then repeat: 77 / 455

Advancing to step 2:
455 goes into 77 0 times with a remainder of 77.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 77 to get 77.
Append the next digit (8) from the dividend to 77 and continue with: 778 / 455

Advancing to step 3:
If we divide 778 by 455, we get 1 and a remainder of 323.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtract 455 from 778 to get 323.
Append the next digit (7) from the dividend to 323 and continue with: 3237 / 455

Advancing to step 4:
455 can be fit into 3237 7 times, resulting in a remainder of 52.
Put 7 as the next digit of the answer. 
Result so far: 17.0
The remainder is 52 after subtracting 3185 from 3237.
Append the next digit (8) from the dividend to 52 and continue with: 528 / 455

Step 5:
The number 455 fits into 528 1 times, leaving a remainder of 73.
The next digit of our result is 1. 
Result so far: 171.0
The remainder is 73 after subtracting 455 from 528.
Grab the next digit (5) from the dividend, add it to 73, then carry on: 735 / 455

Moving on to step 6:
455 can be fit into 735 1 times, resulting in a remainder of 280.
Put 1 as the next digit of the answer. 
Result so far: 1711.0
The remainder is 280 after subtracting 455 from 735.
Grab the next digit (5) from the dividend, add it to 280, then carry on: 2805 / 455

Step 7:
455 can be fit into 2805 6 times, resulting in a remainder of 75.
Use 6 as the next digit of our solution. 
Result so far: 17116.0
If we subtract 2730 from 2805, we get 75.
Append the next digit (7) from the dividend to 75 and continue with: 757 / 455

Moving on to step 8:
The number 455 fits into 757 1 times, leaving a remainder of 302.
Use 1 as the next digit of our solution. 
Result so far: 171161.0
The remainder is 302 after subtracting 455 from 757.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3020, and continue the process.

Going ahead to step 9:
455 goes into 3020 6 times with a remainder of 290.
Write down 6 as next digit of the result. 
Result so far: 171161.6
Subtract 2730 from 3020 to get 290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2900, and continue the process.

Advancing to step 10:
The number 455 fits into 2900 6 times, leaving a remainder of 170.
The number 6 becomes the next digit in our result. 
Result so far: 171161.66
If we subtract 2730 from 2900, we get 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

The final outcome is 171161.66, with a leftover of 0.17.