We look at the division of 12758073 by 77 
The aim is to understand the frequency of 77 in 12758073.

Step 1:
77 can be fit into 1 0 times, resulting in a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Bring next digit (2) of the dividend behind the 1 and repeat the process: 12 / 77

Step 2:
When dividing 12 by 77, we get 0 with a remainder of 12.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 12 and we're left with 12.
Fetch the next digit (7) from the dividend, attach it to 12 and continue: 127 / 77

Advancing to step 3:
When dividing 127 by 77, we get 1 with a remainder of 50.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Deduct 77 from 127 and we're left with 50.
Fetch the next digit (5) from the dividend, attach it to 50 and continue: 505 / 77

Let's proceed to step 4:
77 goes into 505 6 times with a remainder of 43.
The number 6 becomes the next digit in our result. 
Result so far: 16.0
If we take 462 away from 505, we end up with 43.
Grab the next digit (8) from the dividend, add it to 43, then carry on: 438 / 77

On to step 5:
The number 77 fits into 438 5 times, leaving a remainder of 53.
Write down 5 as next digit of the result. 
Result so far: 165.0
Subtracting 385 from 438 leaves us with 53.
Bring next digit (0) of the dividend behind the 53 and repeat the process: 530 / 77

Step 6:
If we divide 530 by 77, we get 6 and a remainder of 68.
The next digit of our result is 6. 
Result so far: 1656.0
The remainder is 68 after subtracting 462 from 530.
Take the next digit (7) from the dividend and append it to 68, then repeat: 687 / 77

Moving on to step 7:
The number 77 fits into 687 8 times, leaving a remainder of 71.
Record the quotient 8 as the next digit in the result. 
Result so far: 16568.0
If we take 616 away from 687, we end up with 71.
Fetch the next digit (3) from the dividend, attach it to 71 and continue: 713 / 77

Step 8:
If we divide 713 by 77, we get 9 and a remainder of 20.
The number 9 becomes the next digit in our result. 
Result so far: 165689.0
The remainder is 20 after subtracting 693 from 713.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 9:
The number 77 fits into 200 2 times, leaving a remainder of 46.
The next digit of our result is 2. 
Result so far: 165689.2
Subtract 154 from 200 to get 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Step 10:
If we divide 460 by 77, we get 5 and a remainder of 75.
Record the quotient 5 as the next digit in the result. 
Result so far: 165689.25
If we take 385 away from 460, we end up with 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Moving on to step 11:
The number 77 fits into 750 9 times, leaving a remainder of 57.
Record the quotient 9 as the next digit in the result. 
Result so far: 165689.259
Subtracting 693 from 750 leaves us with 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

Advancing to step 12:
77 goes into 570 7 times with a remainder of 31.
The next digit of our result is 7. 
Result so far: 165689.2597
Subtracting 539 from 570 leaves us with 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Advancing to step 13:
77 goes into 310 4 times with a remainder of 2.
The number 4 becomes the next digit in our result. 
Result so far: 165689.25974
Deduct 308 from 310 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 14:
The number 77 fits into 20 0 times, leaving a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 165689.25974
Deduct 0 from 20 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 15:
If we divide 200 by 77, we get 2 and a remainder of 46.
Use 2 as the next digit of our solution. 
Result so far: 165689.2597402
If we subtract 154 from 200, we get 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Advancing to step 16:
77 can be fit into 460 5 times, resulting in a remainder of 75.
Put 5 as the next digit of the answer. 
Result so far: 165689.25974025
Subtract 385 from 460 to get 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

After the division, we end up with 165689.25974025 and a remainder of 7.5e-08.