We look at the division of 890406 by 78 
The aim is to understand the frequency of 78 in 890406.

On to step 1:
78 can be fit into 8 0 times, resulting in a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Take the next digit (9) from the dividend and append it to 8, then repeat: 89 / 78

Step 2:
The number 78 fits into 89 1 times, leaving a remainder of 11.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we subtract 78 from 89, we get 11.
Append the next digit (0) from the dividend to 11 and continue with: 110 / 78

Step 3:
When dividing 110 by 78, we get 1 with a remainder of 32.
The next digit of our result is 1. 
Result so far: 11.0
If we take 78 away from 110, we end up with 32.
Grab the next digit (4) from the dividend, add it to 32, then carry on: 324 / 78

Step 4:
78 can be fit into 324 4 times, resulting in a remainder of 12.
Put 4 as the next digit of the answer. 
Result so far: 114.0
The remainder is 12 after subtracting 312 from 324.
Append the next digit (0) from the dividend to 12 and continue with: 120 / 78

Moving on to step 5:
78 can be fit into 120 1 times, resulting in a remainder of 42.
Put 1 as the next digit of the answer. 
Result so far: 1141.0
If we subtract 78 from 120, we get 42.
Include the next digit (6) from the dividend after 42, then repeat: 426 / 78

Moving on to step 6:
78 goes into 426 5 times with a remainder of 36.
Put 5 as the next digit of the answer. 
Result so far: 11415.0
The remainder is 36 after subtracting 390 from 426.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Let's proceed to step 7:
78 can be fit into 360 4 times, resulting in a remainder of 48.
Write down 4 as next digit of the result. 
Result so far: 11415.4
The remainder is 48 after subtracting 312 from 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Advancing to step 8:
When dividing 480 by 78, we get 6 with a remainder of 12.
The number 6 becomes the next digit in our result. 
Result so far: 11415.46
The remainder is 12 after subtracting 468 from 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 9:
The number 78 fits into 120 1 times, leaving a remainder of 42.
Put 1 as the next digit of the answer. 
Result so far: 11415.461
Subtract 78 from 120 to get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Moving on to step 10:
If we divide 420 by 78, we get 5 and a remainder of 30.
Write down 5 as next digit of the result. 
Result so far: 11415.4615
Subtracting 390 from 420 leaves us with 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 11:
78 goes into 300 3 times with a remainder of 66.
The next digit of our result is 3. 
Result so far: 11415.46153
If we subtract 234 from 300, we get 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Moving on to step 12:
When dividing 660 by 78, we get 8 with a remainder of 36.
Use 8 as the next digit of our solution. 
Result so far: 11415.461538
If we take 624 away from 660, 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.

Advancing to step 13:
The number 78 fits into 360 4 times, leaving a remainder of 48.
The next digit of our result is 4. 
Result so far: 11415.4615384
Subtracting 312 from 360 leaves us with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Moving on to step 14:
The number 78 fits into 480 6 times, leaving a remainder of 12.
The number 6 becomes the next digit in our result. 
Result so far: 11415.46153846
If we take 468 away from 480, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

The final result is 11415.46153846 with a remainder of 1.2e-08.