We look at the division of 428073 by 77 
The aim is to understand the frequency of 77 in 428073.

On to step 1:
4 divided by 77 is 0 with a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Append the next digit (2) from the dividend to 4 and continue with: 42 / 77

Let's proceed to step 2:
If we divide 42 by 77, we get 0 and a remainder of 42.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 42, we get 42.
Take the next digit (8) from the dividend and append it to 42, then repeat: 428 / 77

Step 3:
77 goes into 428 5 times with a remainder of 43.
Write down 5 as next digit of the result. 
Result so far: 5.0
If we subtract 385 from 428, we get 43.
Bring next digit (0) of the dividend behind the 43 and repeat the process: 430 / 77

Moving on to step 4:
When dividing 430 by 77, we get 5 with a remainder of 45.
The next digit of our result is 5. 
Result so far: 55.0
Subtracting 385 from 430 leaves us with 45.
Take the next digit (7) from the dividend and append it to 45, then repeat: 457 / 77

Advancing to step 5:
The number 77 fits into 457 5 times, leaving a remainder of 72.
Put 5 as the next digit of the answer. 
Result so far: 555.0
Subtracting 385 from 457 leaves us with 72.
Include the next digit (3) from the dividend after 72, then repeat: 723 / 77

Let's proceed to step 6:
When dividing 723 by 77, we get 9 with a remainder of 30.
Put 9 as the next digit of the answer. 
Result so far: 5559.0
Subtract 693 from 723 to get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Advancing to step 7:
77 can be fit into 300 3 times, resulting in a remainder of 69.
Use 3 as the next digit of our solution. 
Result so far: 5559.3
Subtract 231 from 300 to get 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Let's proceed to step 8:
When dividing 690 by 77, we get 8 with a remainder of 74.
Write down 8 as next digit of the result. 
Result so far: 5559.38
If we subtract 616 from 690, we get 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Going ahead to step 9:
740 divided by 77 is 9 with a remainder of 47.
The number 9 becomes the next digit in our result. 
Result so far: 5559.389
Subtracting 693 from 740 leaves us with 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Going ahead to step 10:
When dividing 470 by 77, we get 6 with a remainder of 8.
The next digit of our result is 6. 
Result so far: 5559.3896
Subtracting 462 from 470 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 11:
77 can be fit into 80 1 times, resulting in a remainder of 3.
The next digit of our result is 1. 
Result so far: 5559.38961
Deduct 77 from 80 and we're left with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Let's proceed to step 12:
When dividing 30 by 77, we get 0 with a remainder of 30.
Record the quotient 0 as the next digit in the result. 
Result so far: 5559.38961
If we subtract 0 from 30, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Let's proceed to step 13:
The number 77 fits into 300 3 times, leaving a remainder of 69.
Record the quotient 3 as the next digit in the result. 
Result so far: 5559.3896103
Subtracting 231 from 300 leaves us with 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Let's proceed to step 14:
The number 77 fits into 690 8 times, leaving a remainder of 74.
Write down 8 as next digit of the result. 
Result so far: 5559.38961038
The remainder is 74 after subtracting 616 from 690.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

After the division, we end up with 5559.38961038 and a remainder of 7.4e-08.