We're dividing 354080 by 77 
The aim is to understand the frequency of 77 in 354080.

Going ahead to step 1:
The number 77 fits into 3 0 times, leaving a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Fetch the next digit (5) from the dividend, attach it to 3 and continue: 35 / 77

On to step 2:
35 divided by 77 is 0 with a remainder of 35.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 35 after subtracting 0 from 35.
Bring next digit (4) of the dividend behind the 35 and repeat the process: 354 / 77

Step 3:
354 divided by 77 is 4 with a remainder of 46.
Use 4 as the next digit of our solution. 
Result so far: 4.0
Subtracting 308 from 354 leaves us with 46.
Append the next digit (0) from the dividend to 46 and continue with: 460 / 77

Going ahead to step 4:
If we divide 460 by 77, we get 5 and a remainder of 75.
Put 5 as the next digit of the answer. 
Result so far: 45.0
If we subtract 385 from 460, we get 75.
Take the next digit (8) from the dividend and append it to 75, then repeat: 758 / 77

Going ahead to step 5:
The number 77 fits into 758 9 times, leaving a remainder of 65.
The number 9 becomes the next digit in our result. 
Result so far: 459.0
If we subtract 693 from 758, we get 65.
Include the next digit (0) from the dividend after 65, then repeat: 650 / 77

Let's proceed to step 6:
The number 77 fits into 650 8 times, leaving a remainder of 34.
The number 8 becomes the next digit in our result. 
Result so far: 4598.0
If we take 616 away from 650, we end up with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

On to step 7:
77 goes into 340 4 times with a remainder of 32.
Put 4 as the next digit of the answer. 
Result so far: 4598.4
If we take 308 away from 340, we end up with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Step 8:
77 can be fit into 320 4 times, resulting in a remainder of 12.
Put 4 as the next digit of the answer. 
Result so far: 4598.44
If we take 308 away from 320, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

The final result is 4598.44 with a remainder of 0.012.