We look at the division of 775404 by 78 
The aim is to understand the frequency of 78 in 775404.

Step 1:
If we divide 7 by 78, we get 0 and a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Fetch the next digit (7) from the dividend, attach it to 7 and continue: 77 / 78

Let's proceed to step 2:
The number 78 fits into 77 0 times, leaving a remainder of 77.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 77 leaves us with 77.
Bring next digit (5) of the dividend behind the 77 and repeat the process: 775 / 78

Advancing to step 3:
If we divide 775 by 78, we get 9 and a remainder of 73.
Use 9 as the next digit of our solution. 
Result so far: 9.0
If we take 702 away from 775, we end up with 73.
Fetch the next digit (4) from the dividend, attach it to 73 and continue: 734 / 78

Let's proceed to step 4:
When dividing 734 by 78, we get 9 with a remainder of 32.
Record the quotient 9 as the next digit in the result. 
Result so far: 99.0
If we subtract 702 from 734, we get 32.
Grab the next digit (0) from the dividend, add it to 32, then carry on: 320 / 78

On to step 5:
When dividing 320 by 78, we get 4 with a remainder of 8.
The next digit of our result is 4. 
Result so far: 994.0
If we subtract 312 from 320, we get 8.
Append the next digit (4) from the dividend to 8 and continue with: 84 / 78

Step 6:
If we divide 84 by 78, we get 1 and a remainder of 6.
Put 1 as the next digit of the answer. 
Result so far: 9941.0
The remainder is 6 after subtracting 78 from 84.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 7:
When dividing 60 by 78, we get 0 with a remainder of 60.
The number 0 becomes the next digit in our result. 
Result so far: 9941.0
If we subtract 0 from 60, we get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

On to step 8:
78 can be fit into 600 7 times, resulting in a remainder of 54.
The next digit of our result is 7. 
Result so far: 9941.07
Subtract 546 from 600 to get 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Step 9:
78 goes into 540 6 times with a remainder of 72.
Write down 6 as next digit of the result. 
Result so far: 9941.076
Subtract 468 from 540 to get 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Advancing to step 10:
78 can be fit into 720 9 times, resulting in a remainder of 18.
Use 9 as the next digit of our solution. 
Result so far: 9941.0769
Subtracting 702 from 720 leaves us with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

On to step 11:
If we divide 180 by 78, we get 2 and a remainder of 24.
Write down 2 as next digit of the result. 
Result so far: 9941.07692
The remainder is 24 after subtracting 156 from 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Going ahead to step 12:
When dividing 240 by 78, we get 3 with a remainder of 6.
Record the quotient 3 as the next digit in the result. 
Result so far: 9941.076923
Deduct 234 from 240 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Step 13:
The number 78 fits into 60 0 times, leaving a remainder of 60.
Record the quotient 0 as the next digit in the result. 
Result so far: 9941.076923
If we subtract 0 from 60, we get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Going ahead to step 14:
When dividing 600 by 78, we get 7 with a remainder of 54.
Put 7 as the next digit of the answer. 
Result so far: 9941.07692307
Subtract 546 from 600 to get 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

After the division, we end up with 9941.07692307 and a remainder of 5.4e-08.