We look at the division of 857485 by 77 
The aim is to understand the frequency of 77 in 857485.

Going ahead to step 1:
77 goes into 8 0 times with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Bring next digit (5) of the dividend behind the 8 and repeat the process: 85 / 77

Let's proceed to step 2:
85 divided by 77 is 1 with a remainder of 8.
The next digit of our result is 1. 
Result so far: 1.0
If we subtract 77 from 85, we get 8.
Bring next digit (7) of the dividend behind the 8 and repeat the process: 87 / 77

Going ahead to step 3:
77 goes into 87 1 times with a remainder of 10.
Put 1 as the next digit of the answer. 
Result so far: 11.0
Subtracting 77 from 87 leaves us with 10.
Include the next digit (4) from the dividend after 10, then repeat: 104 / 77

Advancing to step 4:
The number 77 fits into 104 1 times, leaving a remainder of 27.
Record the quotient 1 as the next digit in the result. 
Result so far: 111.0
Subtract 77 from 104 to get 27.
Grab the next digit (8) from the dividend, add it to 27, then carry on: 278 / 77

Step 5:
77 can be fit into 278 3 times, resulting in a remainder of 47.
Write down 3 as next digit of the result. 
Result so far: 1113.0
Subtract 231 from 278 to get 47.
Include the next digit (5) from the dividend after 47, then repeat: 475 / 77

Moving on to step 6:
If we divide 475 by 77, we get 6 and a remainder of 13.
Write down 6 as next digit of the result. 
Result so far: 11136.0
Subtracting 462 from 475 leaves us with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Step 7:
When dividing 130 by 77, we get 1 with a remainder of 53.
Record the quotient 1 as the next digit in the result. 
Result so far: 11136.1
Subtract 77 from 130 to get 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

On to step 8:
530 divided by 77 is 6 with a remainder of 68.
The number 6 becomes the next digit in our result. 
Result so far: 11136.16
If we subtract 462 from 530, we get 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Let's proceed to step 9:
77 can be fit into 680 8 times, resulting in a remainder of 64.
The next digit of our result is 8. 
Result so far: 11136.168
Deduct 616 from 680 and we're left with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Step 10:
77 can be fit into 640 8 times, resulting in a remainder of 24.
Write down 8 as next digit of the result. 
Result so far: 11136.1688
Subtract 616 from 640 to get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

After the division, we end up with 11136.1688 and a remainder of 0.00024.