We look at the division of 877447 by 77 
The aim is to understand the frequency of 77 in 877447.

Going ahead to step 1:
If we divide 8 by 77, we get 0 and a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Fetch the next digit (7) from the dividend, attach it to 8 and continue: 87 / 77

Step 2:
87 divided by 77 is 1 with a remainder of 10.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we subtract 77 from 87, we get 10.
Grab the next digit (7) from the dividend, add it to 10, then carry on: 107 / 77

Moving on to step 3:
The number 77 fits into 107 1 times, leaving a remainder of 30.
Put 1 as the next digit of the answer. 
Result so far: 11.0
The remainder is 30 after subtracting 77 from 107.
Append the next digit (4) from the dividend to 30 and continue with: 304 / 77

Advancing to step 4:
The number 77 fits into 304 3 times, leaving a remainder of 73.
Use 3 as the next digit of our solution. 
Result so far: 113.0
Deduct 231 from 304 and we're left with 73.
Fetch the next digit (4) from the dividend, attach it to 73 and continue: 734 / 77

Moving on to step 5:
77 can be fit into 734 9 times, resulting in a remainder of 41.
Put 9 as the next digit of the answer. 
Result so far: 1139.0
If we take 693 away from 734, we end up with 41.
Take the next digit (7) from the dividend and append it to 41, then repeat: 417 / 77

Let's proceed to step 6:
When dividing 417 by 77, we get 5 with a remainder of 32.
The next digit of our result is 5. 
Result so far: 11395.0
Subtracting 385 from 417 leaves us 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.

Going ahead to step 7:
77 can be fit into 320 4 times, resulting in a remainder of 12.
Write down 4 as next digit of the result. 
Result so far: 11395.4
If we subtract 308 from 320, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 8:
77 goes into 120 1 times with a remainder of 43.
Put 1 as the next digit of the answer. 
Result so far: 11395.41
If we subtract 77 from 120, we get 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Let's proceed to step 9:
When dividing 430 by 77, we get 5 with a remainder of 45.
The number 5 becomes the next digit in our result. 
Result so far: 11395.415
Subtract 385 from 430 to get 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Step 10:
450 divided by 77 is 5 with a remainder of 65.
Write down 5 as next digit of the result. 
Result so far: 11395.4155
Deduct 385 from 450 and we're left with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

The final result is 11395.4155 with a remainder of 0.00065.