We look at the division of 312093 by 77 
The aim is to understand the frequency of 77 in 312093.

Going ahead to step 1:
3 divided by 77 is 0 with a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Bring next digit (1) of the dividend behind the 3 and repeat the process: 31 / 77

Going ahead to step 2:
77 goes into 31 0 times with a remainder of 31.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 31, we get 31.
Take the next digit (2) from the dividend and append it to 31, then repeat: 312 / 77

On to step 3:
312 divided by 77 is 4 with a remainder of 4.
Write down 4 as next digit of the result. 
Result so far: 4.0
Subtracting 308 from 312 leaves us with 4.
Bring next digit (0) of the dividend behind the 4 and repeat the process: 40 / 77

Going ahead to step 4:
40 divided by 77 is 0 with a remainder of 40.
The next digit of our result is 0. 
Result so far: 40.0
If we subtract 0 from 40, we get 40.
Fetch the next digit (9) from the dividend, attach it to 40 and continue: 409 / 77

Step 5:
When dividing 409 by 77, we get 5 with a remainder of 24.
Use 5 as the next digit of our solution. 
Result so far: 405.0
Deduct 385 from 409 and we're left with 24.
Grab the next digit (3) from the dividend, add it to 24, then carry on: 243 / 77

Step 6:
The number 77 fits into 243 3 times, leaving a remainder of 12.
The next digit of our result is 3. 
Result so far: 4053.0
If we take 231 away from 243, 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.

Going ahead to step 7:
If we divide 120 by 77, we get 1 and a remainder of 43.
The next digit of our result is 1. 
Result so far: 4053.1
The remainder is 43 after subtracting 77 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Advancing to step 8:
If we divide 430 by 77, we get 5 and a remainder of 45.
Put 5 as the next digit of the answer. 
Result so far: 4053.15
Deduct 385 from 430 and we're left with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Going ahead to step 9:
450 divided by 77 is 5 with a remainder of 65.
Write down 5 as next digit of the result. 
Result so far: 4053.155
If we take 385 away from 450, we end up 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.

After the division, we end up with 4053.155 and a remainder of 0.0065.