Let's divide 991966 by 77
The aim is to understand the frequency of 77 in 991966.

Moving on to step 1:
77 can be fit into 9 0 times, resulting in a remainder of 9.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Append the next digit (9) from the dividend to 9 and continue with: 99 / 77

Advancing to step 2:
The number 77 fits into 99 1 times, leaving a remainder of 22.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtracting 77 from 99 leaves us with 22.
Append the next digit (1) from the dividend to 22 and continue with: 221 / 77

Moving on to step 3:
77 can be fit into 221 2 times, resulting in a remainder of 67.
Record the quotient 2 as the next digit in the result. 
Result so far: 12.0
If we subtract 154 from 221, we get 67.
Bring next digit (9) of the dividend behind the 67 and repeat the process: 679 / 77

Let's proceed to step 4:
77 goes into 679 8 times with a remainder of 63.
The next digit of our result is 8. 
Result so far: 128.0
Subtracting 616 from 679 leaves us with 63.
Include the next digit (6) from the dividend after 63, then repeat: 636 / 77

Going ahead to step 5:
The number 77 fits into 636 8 times, leaving a remainder of 20.
Use 8 as the next digit of our solution. 
Result so far: 1288.0
Subtracting 616 from 636 leaves us with 20.
Grab the next digit (6) from the dividend, add it to 20, then carry on: 206 / 77

On to step 6:
77 goes into 206 2 times with a remainder of 52.
Record the quotient 2 as the next digit in the result. 
Result so far: 12882.0
If we take 154 away from 206, we end up with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Step 7:
77 can be fit into 520 6 times, resulting in a remainder of 58.
Use 6 as the next digit of our solution. 
Result so far: 12882.6
Subtract 462 from 520 to get 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Advancing to step 8:
The number 77 fits into 580 7 times, leaving a remainder of 41.
The number 7 becomes the next digit in our result. 
Result so far: 12882.67
If we take 539 away from 580, we end up with 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Moving on to step 9:
410 divided by 77 is 5 with a remainder of 25.
Put 5 as the next digit of the answer. 
Result so far: 12882.675
If we take 385 away from 410, we end up with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Step 10:
77 can be fit into 250 3 times, resulting in a remainder of 19.
Put 3 as the next digit of the answer. 
Result so far: 12882.6753
Subtract 231 from 250 to get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Let's proceed to step 11:
If we divide 190 by 77, we get 2 and a remainder of 36.
The number 2 becomes the next digit in our result. 
Result so far: 12882.67532
If we take 154 away from 190, we end up with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Moving on to step 12:
If we divide 360 by 77, we get 4 and a remainder of 52.
Write down 4 as next digit of the result. 
Result so far: 12882.675324
If we take 308 away from 360, we end up with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Going ahead to step 13:
77 goes into 520 6 times with a remainder of 58.
Use 6 as the next digit of our solution. 
Result so far: 12882.6753246
If we subtract 462 from 520, we get 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Step 14:
The number 77 fits into 580 7 times, leaving a remainder of 41.
Write down 7 as next digit of the result. 
Result so far: 12882.67532467
Subtracting 539 from 580 leaves us with 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

In conclusion, the division gives 12882.67532467 with a balance of 4.1e-08.