We're dividing 781576 by 77 
The aim is to understand the frequency of 77 in 781576.

On to step 1:
77 goes into 7 0 times with a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Bring next digit (8) of the dividend behind the 7 and repeat the process: 78 / 77

On to step 2:
The number 77 fits into 78 1 times, leaving a remainder of 1.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Deduct 77 from 78 and we're left with 1.
Append the next digit (1) from the dividend to 1 and continue with: 11 / 77

Advancing to step 3:
11 divided by 77 is 0 with a remainder of 11.
Use 0 as the next digit of our solution. 
Result so far: 10.0
Subtracting 0 from 11 leaves us with 11.
Grab the next digit (5) from the dividend, add it to 11, then carry on: 115 / 77

Step 4:
115 divided by 77 is 1 with a remainder of 38.
Use 1 as the next digit of our solution. 
Result so far: 101.0
If we take 77 away from 115, we end up with 38.
Append the next digit (7) from the dividend to 38 and continue with: 387 / 77

Advancing to step 5:
77 can be fit into 387 5 times, resulting in a remainder of 2.
Record the quotient 5 as the next digit in the result. 
Result so far: 1015.0
The remainder is 2 after subtracting 385 from 387.
Include the next digit (6) from the dividend after 2, then repeat: 26 / 77

Moving on to step 6:
When dividing 26 by 77, we get 0 with a remainder of 26.
Use 0 as the next digit of our solution. 
Result so far: 10150.0
If we subtract 0 from 26, we get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Advancing to step 7:
The number 77 fits into 260 3 times, leaving a remainder of 29.
The number 3 becomes the next digit in our result. 
Result so far: 10150.3
If we subtract 231 from 260, we get 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

On to step 8:
77 can be fit into 290 3 times, resulting in a remainder of 59.
The next digit of our result is 3. 
Result so far: 10150.33
Deduct 231 from 290 and we're left with 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

After the division, we end up with 10150.33 and a remainder of 0.059.